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Not Updated For Current Season
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Well this is my first build publication that I make, is my Karthus build and is very eficient, i hope it will be useful to you too.
-Purchase a Meki Pendant and 2 Health pots
-Try to get mid, if you get your ultimate early is better for you and your team, if someone else wants to go mid is ok because you'll be farming as crazy.
-When enemy champeon appears start the harrass with Lay Waste.
-Is important to dont stop the Harrass, because you'll keep the enemy champion confused in moving or attacking minions and either way you have the advantage because at the same time that you are making Lay Waste you are farming and regaining mana with the passive ability of Defile.
-If you are out of mana use Clarity.
-Get Sorcerer's Shoes
-When you have Wall of Pain is time to make some killing. Keep harrassing to reduce enemy health to half. Use Wall of Pain and then Exhaust, both to reduce target's magic resistance, keep close to the enemy champ with defile activated and spaming Lay waste. If this went correctly you only need to hit the enemy champ 1 or 2 times with lay waste to get yourself a kill.
-When you have Requiem keep an eye in another lanes to see if there is an enemy with low life, if there is at least one use it and get a kill. (you can also get asistance with this if your companions help a little bit).
-Remember to keep checking for low health enemies and use Requiem only to kill or get an asistance, if is not worth it for that dont use it.
-Purchase your firs archangel staff and start farming for next one.
-Now the Lay waste is not used for harrass, but for deal great damage.
-In this stage of the game you'll be the lead farmer, because your Defile should be at lvl 4 and with that combined with lay waste in some ocations you can farm like no other champ.
-Remember to keep an eye for low health champs.
-Purchase a second Archangel Staff and start farming for a Void Staff.
-In team clash you'll be the key for winning: send Wall of Pain to a place where almost all enemy champs will pass trough, then chose one and Exhaust him. Activate Defile and spam lay waste to the chosen champ and kill him, then if your team did well almost all enemy champs will have a low health so use your Requiem. If you dont score a kill at least you'll have a lot of asistances.
-Purchase a Void Staff and start farming for a Zhonya's Ring.
-Keep farming and sill keep an eye on low health enemy champs.
-Purchase a Zhonya's Ring and start farming for the 2nd Zhonya's.
-at lvl 16 your ult should make at least 1k dmg, your defile like 300 dmg per sec and this is the key for late game.
-Repeat the process of Team Clash, but with the heavy damage of your Defile and Lay Waste you could use Req a bit earlier and still score some kills/assistances.
-Purchase a 2nd Zhonya's Ring.
-At this point Karthus can kill almost everyone quick and easy.
-Destroy enemy base :P
Important things to remember:
-Harrass all along the early game
-Farm a lot
-Kill enemy champs with low health with req as soon as you detect them.
-Don't worry if you die... you can still cast when your are dead for 8 secs.
-Use your Wall of Pain wisely.
-Enjoy getting double,tripple or quadra kills.
I hope you like my build and tactics with Karthus.
Any comments are accepted, I know this build may not be perfetc and if somebody have a better Idea to get it better it will be apreciated.
THX and GG