Champion Rework - Kassadin the Voidwalker
Here, I'll fix it
Passive - Void Stone - Kassadin reduces magic damage received by 20%, Kassadin stores the damage as Void Energy. Upon using an ability Kassadin unleashes the Void Energy granting him 30/50/70% Attack for 2 seconds per stack (max stack 4)
Q - Null Sphere - Kassadin Silences his target for 1.2/1.4/1.6/1.8/2.0 seconds while granting himself a Magic shield reducing incoming Magic Damage by 30/60/90/120/150 (+5% current mana) Range reduced to 500
W - Nether Blade - Passive - Kassadin's Basic Attacks deal 10 (+0.25 AP)(+1% of current mana) magic damage Active - Kassadin Empowers his blade increasing the range by 200, and restoring 4/5/6/7/8% of his missing mana. Amount is increased by 5x against champions.
E - Force Pulse PASSIVE - Kassadin draws energy from spells cast in his vicinity, gaining a charge whenever a spell is cast near him (including his own spells). Upon reaching 4 charges, Kassadin gains the ability to cast Force Pulse.
Active - Kassadin emits a pulse of void energy, dealing 70 / 95 / 120 / 145 / 170 (+ 20% AP)(+4% of current mana) magic damage and Slow icon slowing enemies in a 80º cone in front of him for 1.5 second by 50 / 60 / 70 / 80 / 90%
R - Riftwalk ACTIVE: Kassadin teleports to a 500 range location, dealing magic damage to enemy units within 150 range upon arrival. MAGIC DAMAGE: 80 / 100 / 120 (+ 10% of spent mana) Each subsequent Riftwalk within the next 8 seconds costs double the mana and deals bonus damage, stacking up to 4 times.