Bugger in the Jugger
Example Fed Build
Threats to Kha'Zix with this build
|Fiddlesticks||Depending on the player, Fiddlesticks can either ruin your day or do nothing to you. If he is busy peeling for his back line, you're going to have a bad time. However, if he is just looking to ult into teamfights, you should have an easy time. In duels, you want to constantly leave and enter his zones to break his drain tether.|
|Hecarim||You win early to mid game 1v1s. Late game, he is too tanky to kill and you're best off ignoring him and going for the backline. He has big mana issues early game, so try stealing his blue buff when you can.|
|Evelynn||You win every 1v1 with her. She has low burst until she gets her ultimate and some items. Just make sure not to get caught out by her.|
|Kindred||Make sure to be there to guard/take your that are marked by their camps. You win almost every 1v1 with her because they are just a squishy ADC.|
Hi, I am Khannuuuuur, a Kha'Zix main. Kha'Zix has recently become very strong in the meta and I like (trying) to teach people so why not make a guide.
My goal is to teach you how to play Kha'Zix to an exceptional degree even if you are still relatively new to the champion. Not only that, I hope that you will be able to take something you learned from this guide and apply it to other champions.
Bare in mind that I am still working on this and there may be tons of typos/grammar miztAke5.
Kha'Zix is a melee assassin who relies on a a lead to do well. His unique isolation mechanic makes him the best at assassinating squishy targets that are alone. He has an evolution mechanic that allows him to evolve any of his abilities to adapt to the situation.
When playing Kha'Zix, you must be able to adapt to the current situation to pull off your job of killing carries. Adaptations would include but are not limited to: changing your play style, targets in teamfights, build path, evolution order, deciding who to focus in fights, choosing and prioritizing objectives.
Out of all the assassins, I would say that Kha'Zix would be one of the easiest assassins to pull off. Now I am not trying belittle the efforts of the many Kha'Zix mains out there because all assassins are damn hard to pull off consistently. Just by being a strong assassin player, you deserve some respect, but anyway...
Kha'Zix requires the least amount of mechanical skill out of all assassins. Good estimation and prediction is not necessary on Kha'Zix unlike assassins like Ekko or Shaco. Being on point with your skill shots is not as important on him than on champions like Zed or Fizz. And unlike champions such as Rengar, Kha'Zix does not have high cooldown spells that determine his ability to do his job. In fact, in Kha'Zix's quotes, he tells you how to play him:
You wait for an isolated target and then you kick their ***. His isolation passive even tells you if a target is isolated so you should know when to go in. So if you are new to assassins, Kha'Zix is the champion for you.
However, just because he is the easiest assassin, does not mean he is ineffective, Kha'Zix is easily one the top 3 strongest assassins in the game because he is the most versatile. He can outplay, duel, better sustained DPS than all other assassins(with his evolved Q), he is great at split pushing, and he can even get pretty easy pentakills. Assassin characteristics aside, he can also be a strong front liner if you build tanky, he can play a supportive role with his large AoE slow on his evolved W, and he has strong sustain with his W. Most assassins would be lucky to have 1-3 of all these traits.
Since Kha'Zix is so versatile, he can pretty much adapt to most situations. You will never find yourself in a really hard match up if you are a great Kha'Zix player. I assume you are now convinced that this champion is worth learning. Let's begin.
Pros & Cons of Kha'Zix
- High mobility
- One of the best champions for solo carrying games
- Has huge snow ball potential
- Fairly strong at all stages in the game.
- Has outplay potential with Void Assault
- Decent at split pushing
- Can quickly and easily capitalize on even the smallest mistakes due to your almost instant burst and mobility.
- You are difficult to outplay since you have no important skill shots.
- No hard CC
- Gets boned by hard CC
- Very squishy
- Has mana issues (of varying degrees) at all stages of the game; take a blue buff whenever you can
- Difficult to play when your team is being pushed in.
For masteries, aslong as you run 12/18/0 and you are building assassin Kha'Zix, you should be A-OK. The masteries you choose mostly comes down to personal preference. Just pick whatever makes you feel good. The mastery page shown above is the page that works for me, so it may not work for you.
Just avoid using the following masteries when creating your 12/18/0 page:
- Fury : You are an ability based champion and thus should take Sorcery
- Expose Weakness : Many of the kills you get will not be anywhere near your team since you're an assassin.
- Secret Stash : You use refillable potions, which make this mastery useless
- Meditation : Just get blue buff
- Bandit : You are rarely in lanes, meaning that you are not getting the full use out of this mastery.
- Bounty Hunter : Only good if you can stack it up and you never know if you will be able to.
- Windspeaker's Blessing : Wtf, you ain't no support.
I personally think that you can run whatever rune page you want as long as it gives you AD or lethality and some defensive stats. Other than that, runes have very little impact on the game. Just set up your rune pages in a way that makes you feel comfortable.
I prefer to run x9 AD marks, x9 armor seals, x6 CDR/lvl glyphs, x3 Magic Resist/lvl, and x3 AD quints.
The the AD, armor, and CDR helps with jungle clears. I take scaling magic resist because jungle camps do zero magic damage, which means I can have my magic resist scale up while I am in the jungle.
Here I will talk about the uses for Kha'Zix's abilities. I recommend that you throughly read his abilities before reading this portion of the guide.
Passive: Unseen Threat
You can take advantage of this ability in duels by going in and out of the brush to deal more damage. Just keep in mind that if your enemy warded the brush, your passive will not proc.
The magic damage on this ability scales off of AD.
Q: Taste Their Fear
This ability is your main damage source. You should try to use it when enemies are isolated to as it does more damage that way.
The way this ability marks isolated targets makes Kha'Zix quite a good noob friendly assassin. If an enemy is not marked as isolated, do not go in, if an enemy is marked as isolated, go in and fight.
Just to let you know, like auto attacks, your Q will cancel if your target goes out of sight. Like if you are in a duel and you cast your Q on your enemy and the target walks in a brush while doing so, your damage will not go through, but your Q cooldown and mana will be refunded.
It is also a worthy mention that you can use your Q over walls even when it has not been evolved. And when it is evolved, you can cast it over some pretty thick walls like the dragon/baron pit.
You always max this ability first.
W: Void Spike
This ability has multiple uses. It can be used for sustain, poke, checking brushes, and wave clear, however most of the time you will be using it right as you get right next to someone.
The evolved version makes this ability very good for checking large brushes and peeling for your carries.
It is also handy to note that the evolved W gives vision of all enemy champions hit by it making it great for getting vision over walls such as the dragon or baron pit.
You can cast your W and flash to fire your W in the place you flashed to. This is generally only used to stop people from pulling off close escapes.
You always max this ability second.
This ability is fantastic for escaping, and catching up to your targets. However, you do not want to waste this ability in fights. If you waste it in the middle of a fight, you could potentially lose your only form of escape and die or allow multiple enemies get away from fights on a sliver of health. If you use this ability correctly though, and if you have it evolved, you can easily clean up entire team fights much like Katarina.
You also should never use this ability just for its damage, just think of the damage as a cherry on top or the icing on the cake. Even in the most butt clenching duels, do not do it. Use this to get away instead.
Something also worth mentioning is that if you use your flash mid leap, it will cancel your leap and put you in the spot you flashed to. So for closing large gaps between enemies, try to flash --> leap instead of leap --> flash because you may cancel your E.
You always max this ability third.
R: Void Assault
Use this to dodge skill shots(preferably hard CC), juke your enemies(like walk in one direction, go invisible, and walk in a different direction) or to surprise enemies.
The evolved version allows you to traverse the map quicker and surprise enemies in the jungle.
When you are starting out on Kha'Zix, you probably will not see too many opportunities to use this ability effectively. Most new players just use it to chase enemies.
Keep in mind that this ability has a very short cool down(relative to other ultimate abilities) so do not be afraid to use it.
Some handy things to note:
- Unlike Shaco's Deceive , enemies cannot see the entering stealth particle effect if you are in their fog of war.
- Void Assault can be used after being hit by hard CC to avoid being bursted down.
- Void Assault can be used to dodge some targeted abilities like Garen's ultimate and Darius's ultimate.
- If you have this ability evolved and you run into a brush, get the passive invisibility, and then use the active Void Assault while you are still invisible, your enemies will be able to see the entering stealth particle effect if they have vision in the area your are in.
If you did not understand what I just said in that last bullet, here is a scenario that will explain it:
- You want to gank an enemy mid.
- You have your R evolved.
- You run into mid lane from the side brushes and the get invisibility passive.
- If you cast Void Assault while invisible, the enemy you want to gank will see the "going in invisibile" particle effect/animation.
Take a point in this ability whenever you can.
Evolutions and Evolution Order
Before I discuss the order of evolutions, I must explain what every evolution is good for.
- Good for catching up if you have fallen behind because you can power farm easily.
- Good for dueling more tanky bruiser champions, especially champions like Vi or Zac. But keep in mind that it is not as effective against squishy champions since you can easily kill them without your Q evolved.
- Good for taking important monsters such as the mountain dragon, infernal dragon, or Rift Herald.
- OK supporting evolution (especially for an assassin)
- Decent for catching out alone enemies (like a Blitzcrank, Rocket Grab on a budget)
- Decent peel potential with its large AoE slow, but nowhere near competent when compared to Janna's peel or other support's peeling capabilities.
- Gives Kha'Zix his ability to clean up team fights
- Extra leap range helps in many various situations
- Allows early game tower dives
- Makes you almost impossible to catch.
- Increases map mobility
- Allows you to stealthily sneak up on people without wasting your ultimate.
With all of this said, here is the evolution order:
E/Q > Depends on game > Depends on game
The reason why we evolve only Q or E first is because:
- At level 6 you are mostly ganking and jungling so you are probably not playing much of a supportive role.
- Your E offers superior mobility and outplay potential to having your evolved R
For the 2nd and 3rd evolutions, you basically evolve based on what your team needs. Be sure to try all of the evolutions so you can figure out what works for you in what situations
In this section, I will be covering Kha'Zix's pool of items and talking about in what situations they are good in.
These are core items. Buy these every game if you are playing assassin Kha'Zix
Boots of Speed. They make you go fast, and fast is good. I am the kind of guy who likes to always rush (no pun intended) tier 1 boots on my first back, however you may buy them almost anytime during the early and mid game.
The final boot you upgrade to does not make much difference, so buy whichever one tickles your fancy. However there are a couple guidelines.
Usually, Boots of Swiftness are the go to boots, as they make you go super fast and reduce slows.
Mercury's Treads are better against teams with hard CC that is hard to avoid.
Ionian Boots of Lucidity are only good for getting you to that 40% CDR limit.
Ninja Tabi are actually fairly underrated right now. They are very gold efficient and give lots of defensive stats. I would recommend this against AD assassins that are somewhat ahead.
Boots of Mobility are a very niche pick up. These are for map pressure especially in the early game, however buying these hinders your ability to stick on to targets as you are super slow in combat. Buy these against low mobility carries, and if you want lots of map pressure.
You would generally upgrade your Boots of Speed shortly after your Warrior Enchantment items.
These items are essential to Kha'Zix's build as they provide lethality, a very important stat that increases your damage significantly. You should be buying about 1 or 2 of these.
You would generally buy this as your 3rd (right after your core) or 4th item.
Fiddlesticks, Ahri, or Annie.
This item is especially strong in 1v1s against Vayne. Since the only spell she uses on you is her condemn, you can block it with this. This will allow you to jump her and not get stunned or kited around.
You would buy this as your 4th or 5th item.
Rabadon's Deathcap on a mage or buying an Infinity Edge on an ADC. However, like both Rabadon's Deathcap or Infinity Edge, it lacks utility and is pure damage. Buying this item would usually mean pairing it with something like a Death's Dance or The Black Cleaver to compensate for the lack of utility.
With that said, this should not be bought right after your core items as building utility stats like CDR is more important in the early game. You would generally buy this as your 4th or 5th item.
You would buy this either as your 4th or 5th item.
Ravenous Hydra or Mercurial Scimitar for its life steal, you buy them for their utility.
This item is strong against poke team compositions and against other assassins/squishy targets that you duel.
You would buy this either as your 3rd, 4th, or 5th item.
Zhonya's Hourglass or Guardian Angel to counter you. This item is used to counter their counter.
Upgrade this to Lord Dominik's Regards against in most situations but against champions with strong healing and sustain such as Zac, Aatrox, and Soraka, Mortal Reminder is stronger because it reduces healing.
You would buy this as either your 4th or 5th item.
Feel free to upgrade this to the Ravenous Hydra for tons of AD and a bit of life steal. I personally rarely do this though because Death's Dance much more superior in later stages of the game and if you're split pushing, your kit's wave clear is generally good enough.
You can buy this item as you are building your core items and upgrade it to Ravenous Hydra after you buy some lethality.
Only one of these items are only built 4th or 5th with the exception of Maw of Malmortius as it is usually built as an answer against heavy burst and fed assassins in the early and mid game. These items are completely optional and should only be built to either get an upper hand in duels(especially against other assassins) and to tank unavoidable damage(e.g Katarina's ultimate, Annie's ultimate, and auto attacks) in team fights.
Death's Dance or Youmuu's Ghostblade.
Guardian Angel. Most of the time on Kha'Zix, you die due to being locked down and bursted. Since this item's Quicksilver Sash component allows you to remove all CC, you can cheat death.
When building this item, always buy the Quicksilver Sash component first as it is the reason why we would ever buy this item in the first place.
Dead Man's Plate except it is better for chasing down enemies due to its active AoE slow.
Basically you would choose Dead Man's Plate for running around and picking off targets around the map while Randuin's Omen is better for teamfights where you will get more out of the slow and the extra armor and reduced critical strike damage. All in all, the choice depends on what your team and the enemy team is doing and what objectives are being prioritized.
Azir or Swain.
The 15% increased healing is also really nice. Pair that up with a Death's Dance and a Ravenous Hydra and you will heal for an absolutely disgusting amount of health which will make Aatrox and Soraka mains piss their pants.
Blitzcrank's Rocket Grab or Ahri's Charm. This is also good for those assassins whose damage comes from one ability(like Kha'Zix) as it completely blocks it. However, Mercurial Scimitar is superior over this item if you can react quickly to the incoming CC.
Don't actually buy this unless you are super fed and you want to completely tilt the enemy team.
As of now, there are 134 champions in League of Legends. A handful of them create very different situations for you to deal with, and dealing with some of them is not as intuitive as others. Here I will be talking about dueling and playing against certain champions.
Feel free to suggest any champions you struggle playing against.
Vayne: If you ever played a melee or duelist champion, you know how difficult Vayne is to deal with. Early-mid game, she is just any normal ADC you can kill over and over again, but in the late game she is probably the best duelist in the entire game. She can kill you in about 4-6 auto attacks and easily outplay you.
Edge of Night and Oracle Alteration are fantastic items for outplaying a Vayne. Since the only spell she uses on you is her Condemn, Edge of Night's spell shield will block it, avoiding her stun and being peeled away from. Oracle Alteration will allow you to track her during her stealth.
Before I explain how to outplay her, I want to show you this graph I made.
As we can see, we deal bursts of damage, and deal almost no damage during cooldowns, while Vayne does consistent damage throughout a fight.
The grey line labeled as "death" represents the amount of damage each of us(since we are almost both as equally squishy) can take before dying. It is clear that the longer we duel the more in favor the fight is in for Vayne.
So, to beat Vayne, you have to not fight her, which sounds odd at first. Basically, you got to engage on her, burst her, quickly disengage, wait for cool downs, engage/burst her again, and rinse and repeat until she is dead. The engage and disengage part can be done using your E, R and maybe a flash.
Shaco: This guy is very deceptive. He can look like a very free kill at first but then quickly turn a fight on you. He is all about juking you with his stealth and baiting you into traps with his boxes. If you don't fall for his tricks, you can easily beat him.
Remember where he places his boxes and don't be a fool to chase after him only to run into a box. It is also helpful to note that you should generally back off once he has popped his ultimate because there is usually no telling which is the real one unless the Shaco player uses some ability or item to blow his cover.
Miss Fortune, Jhin, Xerath, and Vel'Koz: These three share something, their ultimates. The moment they cast their ultimate, their team usually(but not all the time) abandons them to follow up on the damage. This is your time to shine. Since they are alone, you can usually pick them off very easily and turn a fight around.
Initial Jungle Clear
In this section of the guide, I will be talking about one of the more important parts of playing any jungler; the first jungle clear. Kha'Zix's first clear gets him low on health and he his very vulnerable to an early invade and if you do not clear the camps right, you will probably end up being executed. I will be covering how you can stop yourself from feeding the stupid Gromp and how to stay safe from invades.
Hunter's Talisman is good for sustain clears and mana sustain while Hunter's Machete is good for quick clears; you can decide which one you buy. I myself tend to switch back and forth between them as it really makes little difference. Take the refillable potion if you are confident you can do a full clear or if you are going to do a full clear. Take the 3 health potions if you want to invade or gank after your clear or if you are just not confident in your clear.
Clear routes are very simple on Kha'Zix.
Full Clear: Blue Buff > Gromp > Wolves > Raptors > Red Buff > Krugs
**You should learn to do the full clear with the refillable potion and without taking scuttle crab**
Since smite buffs have been removed, you generally want to just save your smite if you get low on health and for the hard camps like the raptors and krugs.
Generally do the full clear if the enemy jungler does not typically invade. However, if the enemy jungle is any of these champions- Shaco, Rengar, Lee Sin, Evelynn-you should just clear your buffs first. This throws off the timing of their invade and it also ensures that they cannot steal your buffs.
Clearing Tactics for Each Camp
IN GENERAL: Do not use you Leap to kill the camps as you could use it to kite the camp or escape. Use your Q and W when ever you can. Make sure you hit all the monsters with your W and make sure you are close enough to get the sustain.
Blue Buff, Red Buff, Gromp: Single monster camps... piss easy for you to take. Kite these to your next jungle camp for faster clear speeds.
Wolves: Focus the smaller wolves before killing the two-headed one. You may kite the camp towards your Raptors.
Raptors: Save your smite for this camp. Q+Smite+AA the large raptor first. You will one shot it. Hit all of the small raptors with your W. Auto attack or Q every raptor while kiting the camp until your W is off cooldown. This camp can be very difficult if not done right, make sure to follow this method.
Krugs: Kill the small Krug, then start focusing the large Krug. Once you kill the large Krug, just focus which ever Krug is the biggest. Be sure to hit all of the krugs with your W.
Early game starts as soon as the minions spawn and ends right about when people stop going into their assigned lanes and begin grouping up.
This part of the game is very important for Kha'Zix because your performance heavily changes what you will be doing in the mid game. You should be really focusing on one thing:
It does not matter how you acquire this lead, but it is usually from killing other players and out farming the enemy. Keep in mind that getting this lead is not easy. Your early game is OK, but not as good as someone like Shaco or Lee Sin.
In and ideal game, you should have at least 3 kills and be 1 or 2 levels ahead of the enemy before the early game ends. You need this lead because when it allows you to snowball and carry games.
So... how to get this lead. Well from the moment you finish your first clear or recall for the first time, you should be looking for kills and farm.
When you're not ganking, you should be farming. Don't be one of those people who run up and down the river just waiting for a gank opportunity, don't be one of those people who hide in a warded brush thinking the enemy will push. That's wasting your time.
As an assassin jungler, you really have to farm hard to stay relevant. In between ganks or moving around the map, you should be taking whatever jungle camp is closest to you.
You may also take the enemy jungler's farm. If they show up someplace on the map that is quite far from you, if you are quick, you can take their camps for free. Just make sure when doing this you are safe. Ward areas that people trying to stop you may go through you that you know when danger is coming.
If one of your laners backs, you can go to their lane and farm for them there, especially if the enemy laner is at the tower. Just remember not to push their lane too much otherwise you may have an angry teammate.
Also do not be afraid to just walk into the enemy jungle. You can duel a majority of junglers early on if they are not too fed. If you find some camps to take, drop a ward somewhere to make sure that the enemy jungler is not coming and farm away.
While farming, you want to constantly be looking for ganks in the lanes as it is a key part of getting kills. When you look for ganks, you want to find the lanes that are the easiest to gank. In general, laners that, are Pushed up, have low mobility, have low CC, have low 1v2 and outplay potential (e.g Darius, Singed, Yasuo), are at low health
are easier to gank. (Keep in mind that a gankable lane does not have to have all of these characteristics)
Consider all these factors before ganking. It will take time to learn what lanes you can or cannot gank, but I will not go over this because you can only learn this through many games of experience.
Also keep in mind that you do not always have to gank for a kill. It is OK to just force the laner to back, burn a flash, or even just give your laner the health advantage.
Now that you know how to find ganks, here is a step-by-step guide on how to gank:
- Make sure that there is not a new minion wave coming in. Very important to avoid minion aggro and get off your isolation damage.
- SPAM THE On My Way! PING IN THE LANE TO MAKE SURE YOUR LANER FOLLOWS UP
- Walk into the lane behind the enemy. If you come in from their side, they can easily run away for free.
- Q, W and auto attack them until they die. Use your leap only if they use their escape.
- If you end up tower diving, make sure that whoever has more health is the one tanking the tower. DO NOT TOWER DIVE IF YOU ARE BOTH LOW ON HEALTH OR IF THE ENEMY HAS LOTS OF HEALTH especially in the early game.
Just remember that you should only take what is safe to take. Suppose if the enemy burns his or her flash and gets away, that is fine because you can just come back in another minute or so and get the kill.
If you burned the enemy's flash or if you guys get a kill, don't be afraid to tax your laner. However this does not mean you can be a ****head and take the next wave, just take like 2-3 minions at most. If you do not get the kill, you should feel free to take 1-2 more minions or smite a cannon minion on top of the normal tax.
Mid and Late Game
Mid game is the phase of the game can be horrible or the time you go ham. If you stayed on top of farming and you might have gotten a lead, that's great, but if you are maybe 2 levels behind and you have died a couple times... it's going to be a rough ride.
But no matter what happened early game, you should be prioritizing objectives and this includes taking them and defending them. If your team is behind just try to defend, push minion waves, and try not to die. If your team is ahead by all means, go for those towers and dragons. Do not forget about the Rift Herald too. You may give it to a split pusher or to yourself if you are fed.
If your team has good wave clear champions(e.g Azir, Anivia, Caitlyn) and is ahead, you can group up and take towers everywhere. However this is usually not the case especially in solo queue.
If you have fallen behind, just start building tank. You may start building damage items if you have caught up in levels.
If you did manage to keep up in levels and gold, you want to get as many objectives as possible and possibly end the game. As an assassin, the way you would usually take objectives is by assassinating key targets and then forcing objectives with a numbers advantage. Now just remember: Objectives > Kills. I have seen some people go ham mid game but do not get any objectives and then when late game comes, they get stomped.
Late game is the same as the mid game. The only difference is that you are now prioritizing baron and you should be grouping with your team more often.
It is also very important to note that your damage has slightly fallen off. Keep in mind this power loss and you should be fine.
Team Fights and Skirmishes
In team fights, you generally sit around the side of the fight(preferably out of enemy vision) and wait for people to get low so you can get leap resets. Against teams with strong, unavoidable lock down or peel(e.g Alistar's Headbutt or Annie's stun, you generally want to wait for those spells to be used.
If you have the time, watch the video below by ScrapComputer. It covers when you should enter fights as an assassin in much detail and depth.
Skirmishes are similar to team fights except you have more chances to enter the fight. Since people are generally more spread out and there are generally fewer people, you will rarely get blown up the second you join a fight. CC and being kited must still be factored in though.
Split pushing is when a champion diverges from the team to push lanes and towers(typically side lanes) in hope of either:
- Distracting multiple enemies so your team can take objectives
- Taking towers
- Distracting one key member of the enemy team for a long time
Generally split pushers have these characteristics:
- Can take towers fast
- Decent waveclear
- Many escapes, tanky, and/or can 1v1 most champions.
Kha’Zix has decent wave clear and takes towers fast, he can 1v1 most champions in the game and can take on 2 or more people if your enemy has bad positioning. He also has very strong escape abilities, but he is not tanky. If you get bursted down and/or if the enemy team can chase you, you’re dead.
To prevent dying, make sure that there is no one sneaking up on your to kill you. As you push your lane, drop some wards in paths people may take to flank you.
Make sure to tell your team(via pings or chat) to take objectives when you have drawn attention from multiple people on the enemy team.
Kha’Zix is not the strongest split pusher. Typically he is only strong in certain match-ups.
Split pushing works exceedingly well against strong teamfight compositions. Champions like Orianna, Azir, Wukong, Amumu, Twitch, Blitzcrank, etc are all strong team fighting champions. Generally, these strong teamfight champions are not that strong in a 1v1, so if you force one of them to deal with you, that means your team has an upper hand in say a 4v4 and you will have the upper hand in a 1v1. Make sure to exploit this in the right situations.
Strong 1v1 champions can easily chase and shut down squishy split pushers such as yourself. Champions like Camille, Yasuo, Vayne, LeBlanc, and Rengar can shut you down easily. If more than one champion on the enemy team can 1v1 you, I would suggest not split pushing.
Practicing and Improving
Kha'Zix has a bit of a skill curve and relies on being ahead or even to be relevant in a game. Don't be disappointed if you do poorly.
Until you can always be impactful with him 9/10 games, I highly recommend you do not take him into ranked.
One of the ways I have improved at playing Kha'Zix is by simply watching people play the champion. Notice how people use Kha'Zix's abilities to outplay people and when they enter fights. Doing this allows you to get an idea of what is possible on the champion.
These two montages are particularly good at showing off Kha'Zix. I recommend watching them.
(Yes, these are pre-rework Kha'Zix videos, however many of the things he can do today are still possible)
However, while watching other people play Kha'Zix is good and all, the most effective way of improving is simply playing Kha'Zix. Get out there are start playing.
In this section I will just be talking about some miscellaneous things.
I came across this weird bug (no pun intended) while I was messing with Kha'Zix on the practice tool that allows Kha'Zix to auto attack over the Krug wall.