Daemos: The Hand of Oblivion

So I had an idea for a unique form of, almost, crowd control that I thought could be a neat addition into the game, so let's get into the kit and you'll see what I mean. And for the fact I don't know yet how to balance skill damages, I will just imply the skill's ratios for damage (AD or AP).

Type: Melee Mage Role: Mage Secondary: Assassin

Passive: Oblivion's Presence Daemos receives an additional 1 mana regeneration per level, as well as when dealing damage to champtions, steal mana equivalent to 1% of your damage dealt. This effect cannot occur on any champion more than once every 5 seconds.

Q: Void's Embrace Daemos opens the void in a target circle, damaging all enemies within the spell, over time. If any enemy is within the skill for 2.5 seconds, they are stunned.

Scales: AP Stun Duration: .5/.75/1/1.25/1.5 seconds Cost: 50/55/60/65/70 Cool down: 14/13/12/11/10 seconds

W: Dread Claw Dashing a short distance to a targeted enemy, Daemos attacks twice, furiously, rooting them.

Scales: AD and AP Root Duration: 1.25/1.5/1.75/2/2.25 seconds Cost: 65/70/75/80/85 Cool down: 17/16/15/14/13

E: Corruption's Call Daemos becomes consumed by corruption as the void burrows him under the ground, reanimating him swiftly in the direction of the mouse. If Daemos reanimates near an enemy, he swings at them, scarring them, dealing damage over time.

Scales: AD and AP Cost: 40/50/60/70/80 Cool down: 17/16/15/14/13

R (Ultimate): The Living Oblivion Daemos brings forth Oblivion in his wake, casting Ruin on all enemy champions that take damage from this ability an area around himself, disabling all those afflicted's passives for a short duration, as well as speeding himself up.

Scales: AP Ruin Duration: 4/5/6 seconds Speed: 10/15/20% Buff Duration: 6/7/8 seconds Cost: 90/95/100 Cool Down: 80/70/60 seconds

I thought perhaps this could lead for more counter play to characters like Aatrox and Fizz who can heavily rely on their passives in the laning phase as well as the team fight phases of the game

Feel free to give any feed back if you wish. Thank you for reading, none the less!