PASSIVE
Void Stone
Kassadin takes reduced magic damage and ignores unit collision.

Q
Null Sphere
Kassadin fires an orb of void energy at a target, dealing damage and interrupting channels. The excess energy forms around himself, granting a temporary shield that absorbs magic damage.

W
Nether Blade
Passive: Kassadin's basic attacks deal bonus magic damage.
Active: Kassadin's next basic attack deals significant bonus magic damage and restores Mana.

E
Force Pulse
Kassadin draws energy from spells cast in his vicinity. Upon charging up, Kassadin can use Force Pulse to damage and slow enemies in a cone in front of him.

R
Riftwalk
Kassadin teleports to a nearby location dealing damage to nearby enemy units. Multiple Riftwalks in a short period of time cost additional Mana but also deal additional damage.