[Champion Concept] Sjena, the Umbramancer
Umbramancer, odd title huh? Either way, an Umbramancer is a Shadow Mage (AP ZED!? Nope)
Passive: Corrupted by Shadow- Every time that Sjena casts a spell on a champion, they gain one stack of {Corrupted Heart}. If an enemy gains 4 stacks of {Corrupted Heart}, they take Magic Damage over time
Q: Shadow Bolt- Sjena fires a bolt of Shadow, dealing Magic Damage, PLUS a percentage of the enemy's MAX HP %. If the enemy is taking damage from {Corrupted Heart}, Shadow Bolt applies two stacks AND restarts the magic damage countdown. (IE: If it lasts 10 seconds, and 4 seconds have passed, it would go back to 10 seconds.)
W: Shadow Dash- Sjena disappears into the shadow, becoming untargetable for 2 seconds, and jumping to a target area, doing damage and slowing all targets hit. If an enemy is effected by {Corrupted Heart}, then the cooldown is halved.
E: Eye's of Shadow- Sjena gains vision of a target area (Same range as Blue Trinket). If she sees a champion effected by {Corrupted Heart}, then Sjena does damage to that target.
R: Shadow's Torture- Sjena curses target enemy, dealing damage, applying {Corrupted Heart}, and slowing the target. If the target is effected by {Corrupted Heart}, then Sjena does a percentage of their max HP. If the target dies, Sjena gains a portion of her missing health back.