Hello I'm rd71. I'm platinum (but elophant can't find me) and i don't speak a lot of english so forgive me for my english.

Well its quite simple, Kassadin has a 7/5/3s flash. This means a lot of things, like faster jungle clear and roam (because he can jump walls), easier time ganking (because he can jump wards) aand easier time killing (because he can jump from nowhere and slow and chase enemy champs forever).

As a jungler kassadin can get rid of all the problems that prevented him from raping enemy team:

• ****ty Early game? - You are not laning.
• Mana problems? - You start with blue.
• Hard time last hitting/pushing? - You are in the jungle baby!
• Fear of losing tower? - Your mid laner can care about that.
• Enemy plays safe when you are MIA? - Now you are always MIA!.
  

Now you ask, is this possible? Kassadin has a great weakness and that is the lack of sustain in the jungle. But Spirit of the Spectral Wraith can give it to you now. Why? Because this item used to give spellvamp, and spellvamp doesn't proc from on-hit effects. Now it heals you for a % of the damage you do, so it provides enough sustain in the jungle.

Pros:

• Insane ganks post-6.
• Global presence with Riftwalk.
• Fast jungle clear once you get Spirit of the Spectral Wraith and Riftwalk.
• Gets stronger as the game goes on.
• Can evolve into the good old kassadin late-game.
• Uncatchable.
• Can chase everyone, even Nidalee.
• Will always be op.
• Enemy can counter pick you with a mid laner.

Cons

• Warwick syndrome: your pre-6 ganks are kinda meh.
• Sustain problems before you get Spirit Stone.
• Can get counterjungled pre-6.
• Will be nerfed.
• Requires extreme mana awareness to use him at his full potential.

Marks: These marks will greatly increase your jungle clear, combined with Nether Blade and your high base damage.

Seals: The only viable choice, armor seals help mitigate monster damage.

Glyphs: These increase your jungle clear and overall damage. You don't need Greater Glyph of Magic Resist because jungle monsters (except baron nashor) don't deal magic damage at all. Anyway you already have Void Stone, and MR runes will never reduce your damage past 13%.

Quints: Faster clear with these. Greater Quintessence of Movement Speed aren't really essential because once you are 6 you can jump walls.

Void Stone

Reduces the magic damage you take in 15%, it is useful because you can take Greater Glyph of Ability Power. It also ignores unit collision, which I don't really like, since kassadin most successful way to gank was from behind while body blocking the enemy.

Null Sphere

This spell is very weak in terms of DPS, you don't use the shield in the jungle, but is very good when killing mages. Max this last.

Nether Blade

This one provides the highest raw dps with the active and passive. It also provides an auto attack reset so ensure to AA first then use nether blade.

Force Pulse

This one is so good to jungle clear past lvl 6. It is AOE, it is a slow, it is better for ganking because you can spam it more. Max this second.

Riftwalk

This spell makes kassadin OP. You can't escape him and you can't kill him. I recommend to use it every 12 seconds only, to reset the timer. 3 consecutive riftwalks don't hurt but the fourth will hurt a LOT. Level this always you can because the cost doesn't increase with levels.

You don't really have other choice. Flash is the extra riftwalk you need to kill everyone, to escape, etc.

Spirit of the Spectral Wraith: This item is awesome, it gives you sustain in the jungle, extra AP and extra gold. Sell it later in the game (if your game lasts enough).

Sorcerer's Shoes - Homeguard: Experienced kassadin players know homeguard is a must rush enchantment. It enhances your global presence. Get this ASAP.

Tear of the Goddess This item will always be essential on kassadin because of his high mana costs. Remplacing this with any other mana item is stupid. Kassadin doesn't need mana regen, he needs a big mana pool because he isn't a poky mage like ziggs or nidalee, he is a burst assassin that throws everything, wasting lots of mana in short amounts of time.

Rod of Ages You are the jungler now, you need to be tanky. You are also more melee oriented. Anyway you can always go for the old kassawin build, rushing Mejai's Soulstealer and Zhonya's Hourglass instead of Rod of Ages.

Mejai's Soulstealer This item was made for kassadin, if you want to stomp, get this. It has downsides, like coordinating the enemy team into focusing you and delaying your build.

Rabadon's Deathcap Essential on Kassadin. Your base values are worse than ever, so you need to rely more on your AP.

Void Staff Essential too, this counters MR.

Archangel's Staff Essential on Kassadin, you need the mana. Also gives you a REAL shield, and goes very well with Rod of Ages.

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Zhonya's Hourglass The stasis is very good, the armor too and gives tons of AP also. If you skip ROA, get this asap.

Abyssal Mask This one boosts your damage to squishy targets and gives you MR. Get this if enemy Magic damage is giving you trouble, but you want to keep an offensive build.

Guardian Angel The most defensive choice. Think wise, defensive choices allow more aggressive play.

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Lich Bane Don't get this item. There is no room for it in the game. Early game you have to rush jungle sustain and solve your mana problems. Mid game your jungle clear is already fast enough and depends more on mobility and Smite. Late game you are the old kassadin again, you DON'T want to get into melee range. Maybe, you can replace boots for this very later in the game.

Start at Ancient Golem. If you don't suspect an invade/steal/blitzcrank, use smite first and tell your teammates to help you. Then go to the big wraith Camp or the two Golem camps and then the Elder Lizard. Early game kassadin doesn't have a fast clear in the Wolves or the Small Wraiths because your kit is single target centric. After 6 Riftwalk gives you enough Force Pulse Stacks to spam it more.

Your pre-6 ganks are meh, but still if you manage to get into melee range they can be successful. Always be on a move, either focus on farming and rushing lvl 6 and jungle items or be aware of the map for gank/counterganks etc. If it is worth, you may use your Flash as a Riftwalk to get into range for an early gank.

Kassadin ganks are strong. This relies on the fact that no one can see you come or flee from you. Try your best to appear from nowhere when your lanes are in the middle of a trade. The most devastating way kassadin ganks is to convert normal lane trades into kills, like a 2v2 into a 3v2 etc.

Top lane.

Early Top lane ganks are always tricky. This lane usually gets ganked at the 3 minute mark but you will usually lose a 2v2 so avoid counterganking pre-6. However if you manage to get behind of the enemy and land your skills it can be good. After 6 ganking top depends on the enemy. The best way to gank Top is with a Lane gank. Simply riftwalk inside a Bush when the lane is pushed, tell your top to bait (try to bait the enemy escape) and engage and then jump in. You can also gank from behind, DO YOUR BEST TO SKIP THE TRIBUSH.

Mid lane.

Ganking Mid Lane is simple, just don't cry when ganking your old home. Just walk from the side, as soon as you see the enemy reacting, riftwalk in throw your combo and keep AAing. In you managed to get closer enough, don't use riftwalk at first, but when they use flash or their escape to stick to the enemy.

Bottom Lane

Early Bot lane ganks are usually better from the side, because the lane bushes are warded to avoid Support all-ins, and the tribush is always warded instead of the river, because dragon control isn't important that early. Riftwalk ganks are super deadly. The best way to gank Bot lane is from behind. Sneak into the enemy jungle and step into the corner behind the enemy turret. Wait for the best moment and Riftwalk In from behind trying to Force Pulse Bot the ADC and the Support. Another way to gank bot lane is a bush gank, Riftwalk into the bush when bot is overextended, then all in.

Remember, do NOT gank if you are low , do not gank if the HP difference between your ally and your enemy is too high, instead stay and take care of his tower.

After a succesfull gank remember to take your MINION TAX, help your laner to push his lane (so the enemy loses all that farm and exp to his tower), and to take the enemy turret.