[CHAMPION CONCEPT] Deadlock, The Revenant

So I've been working on a new champion:

Deadlock

The Revenant

http://i.imgur.com/tghhdmN.png

ABILITIES:

Passive: Deathgrip

Upon dying, Deadlock’s killer is stunned for 1.5 (+[0.125% of armor]) (+[0.25% of magic resist]) seconds.

Q: Rip Mana

Cost: 40/60/80/100/120 Mana | Cooldown: 18/16/14/12/10

Deadlock rips magical essence from his target, dealing 40/55/70/95/110 (+[15% of Deadlock’s maximum mana]) damage to mana plus damage equal to 10/13/16/19/21% of the target’s missing mana. If the target champion’s mana is brought to zero by this ability, Deadlock gains 10 armor and magic resist permanently. If the target has no mana, health damage is done instead. Stacks are also gainable by killing champions with this ability.

W: Mana Mail

Cost: 80/75/70/65/60% of incoming damage | Cooldown: 1/1/1/1/1

Deadlock equips mana mail. Incoming damage deals 50/57/54/51/48% to health and 80/75/70/65/60% to mana.

E: Cursed Veins (Toggle)

Cost: None | Cooldown: 30/28/26/24/22

Deadlock channels the flow of his blood.

Off: All mana regen is converted to health regen. On: All health regen is converted to mana regen.

R: Petrify

Cost: 80/100/120 mana | Cooldown: * 75/60/45*

Deadlock’s next basic attack will root the target enemy champion in place for 2/2.5/3 (+[0.5% of armor]) (+[1% of magic resist]) seconds.

LORE

Long ago, during the very beginning of civilization, feuded two halves of a tribe: One called themselves Noxus, and the other named itself Demacia. While Noxus valued strength in all forms, Demacia sought order and justice above all. Eventually, conflict broke out between the two, and leading the first ever Noxian skirmish was a very powerful Necromancer.

He dethroned the chieftan, who was a very powerful mage. However, the chieftan brought the roof of the palace down upon the Necromancer as his last act before dying. As the Necromancer lay dying under the wreckage of the building, he enchanted himself to rise from the dead in the far future. Upon revival, the Necromancer had one wish: the destruction of Demacia.

GOOD ITEMS

SKINS

Deadmau5lock

Dreadlocks

Headlock (Wrestler skin, akin to Boom Boom Blitzcrank)

Bedrock (Basically if Malphite and Deadlock hit each other in a high speed collision)

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So, let me know what you guys think! It's slightly rough at this point, so any contributions and feedback would be greatly appreciated. Do you think any of his abilities are overpowered, underpowered, or otherwise unbalanced? Please let me know and feel free to share ideas of your own about this.