Obscurum, The Betrayed

Champion Attributes: Assassin, Fighter, Melee

Innate: (Unholy scales)
When he has above 50% Hp he gains ability power and attack damage
When he is below 50% Hp he instead gains Armor and Magic resist
Bonus AP/AD: 20 Bonus Resistances: 20

First ability (Twin Darkness)
He fires two bolts of darkness, the one that appears at his right does
Magic damage while his left bolt does Physical damage. When both strike
the same target, the target becomes stunned for 1 second
Physical damage: 80/110/140/170/200 (0.5 Bonus AD)
Magic damage: 80/110/140/170/200 (0.4 Ability Power)
Cooldown: 8
Mana cost: 85

Second ability: (Shadow Rift)
He summons a rift of darkness on the ground, slowing enemies and
reducing magic resist to enemy champions in the area, after 3 seconds
the rift explodes and deals damage to enemy champions.
Magic damage: 60/90/120/150/180 (0.7 Ability power)
Magic penetration: 10/15/20/25/30
Slow: 40%
Cooldown: 12/11/10/9/8
Mana cost: 70/80/90/100/110

Third ability: (Eviceration)
Range: 300+600
He dashes while striking enemies in his path, if he kills a unit when it is on
cooldown he gains a second dash, dashing further but damaging enemies
at the end of the dash but refreshing the cooldown.
Damage:15/40/65/90/115 (0.5 Attack Damage)
Total damage: 30/80/130/180/230 (1.0 Attack damage)
Mana cost: 100/80/60/40/20
Cooldown: 24/22/20/18/16

Ultimate: Imprisonment
He targets an enemy champion, suspending him for 1.5 seconds while
transforming into his true form and becoming untargetable for 1.5
seconds while dealing damage to the target every 0.25 seconds
He also gains 50% Spell vamp for the duration
Damage: 600/720/840 (1.2)
Damage per tick: 100/120/140 (0.2)
Mana cost: 120/160/200