Kassadin is, in my opinion, one of the best and strongest mages in the game if played and built correctly. Kass has always been my favorite mage and he was the first champion I purchased. If you want to get two or three kills and thereafter be nearly unstoppable then Kassadin is the choice for you.

Kassadin uses the main combo riftwalk close, force pulse, null sphere, riftwalk out. This combo can drain people's health bars too fast for them to react. Especially with null sphere's silence. Start using this combo to abuse and or pick up kills after level six. Before level six, early game, just try to last hit. Be weary of using your spells because of mana restraints. Late game continue with the combo and try to stay alive to save mejais stacks.

This rune setup gives you a nice cooldown rate late game capping at around 4-5 seconds for riftwalk. Combined with archangles mana this can allow you to nuke people down with purely your ult. The extra magic pen and ability power gives you a nice advantage early game. The extra mana regen gives you another nice buff late game.

Items on kassadin are so important. First let me state, if you do not like stacking items DO NOT TAKE MEJIAS! A suitable replacement for early game is Morrelo's Evil Tome. If your having a having a bad early game and you think you could use the extra mana go for tear of goddess first. Lastly, if the enemy team is NOT stacking magic resist DO NOT GET VOID STAFF! Instead get Abyssal Scepter. If you are having a really good early game you could try to get archangles first however this is more risky.

Masteries on Kassadin are much like any other caster. Get the extra magic pen from attack. Then use the remaining 21 points in utility making sure to get spatial accuracy for better teleport.

Now you may be wondering why I tell you to wait to level your ult at level 11. Well, the damage from your ult isn't that important, you actually get a the most damage from force pulse, null sphere combo. Therefore, upgrading forcepulse to level 5 before getting upgraded ult gives you much more damage.

Kassadin is an amazing mage if played correctly. He is also tons of fun to play and has an amazing flash on command ability. All in all, if you want to destroy people mid game in two seconds, look no further than K ***adin.