Ruined King Champ Kit

The Ruined King is a pretty involved in the lore of several of League's champs, the Shadow Isles peeps, and seems like he would be a pretty cool champ to have. Here's a possible kit for him, any feedback is appreciated. Model wise, I imagine something like a cross between Morde and Karthus, more royal than Karthus, but less living suit of armour than Morde. The objective of this kit is to create a melee bruiser/mage mix.

TL;DR Lore: Once upon a time there was a mage-king, wife got sick and died, went to the Blessed Isles to revive her, instead creating a corpse thing, and turning the Blessed Isles into the Shadow Isles.

Health: 540 - 1900 Health Regen: 6.50 - 18.45 Attack Range: 150 Attack Damage: 56.5 - 117 Attack Speed: 0.625 + (0 - 24%) Armour: 25.6 - 83.4 Magic Resist: 31.2 - 45 Move Speed: 345

Passive: Negation: Instead of mana or energy, RK's are completely free to cast. However, they become empowered when RK has a charge of Negation. Negation has a charge cap of (5/10/15/20), and is gained through: last-hitting minions/jungle monsters, giving 1/5 of a charge, while AA a champ/tower/epic monster gives 2/5 of a charge. Charges are also gained passively, gaining a charge every (30/20/10) seconds.

Q: Hatred: CD: (12/10/8/6/5) Range: 560/60% RK swings his blade wildly in a cone in front of him. This slows all enemies caught in the area, dealing (60/80/100/120/140) + 60% AP. Empowered Q: If RK has 5 or more charges, this ability becomes empowered, shredding (10/15/20/25/30) of the enemies MR, and giving the RK Ire, increasing his AA speed by (10/20/30/40/50)%. This consumes 5 charges of Negation.

W: Borrowed Hope: CD: (30/25/20/15/12) Minion CD: (15/12/9/6/3) Range: 1000 RK sorrows a target, reducing the damage they deal to him by (10/15/20/25/30)% for 5 seconds. If RK targets a minion or non-epic jg monster, he deals (20/25/30/35/40) + 30% AP, and heals for the damage dealt. Empowered W: If RK has 5 or more charges, this ability stuns the target for 0.25 seconds. This consumes 5 charges of Negation, and only procs when used on champs.

E: Ageless Misery: Passive: (Active when not on CD) Active: (14/12/10/8/6) Passively, RK AA deal (1/1.5/2/2.5/3)% + 1% per 100 AP, of target's max health as magic damage. Actively, this bonus is doubled, lasting 3 seconds. Empowered E: If RK has 5 or more charges, this ability inflicts King's Despair on a target, dealing DOT, (10/20/35/45/60) + 5% AP, every second for 2 seconds. RK can only inflict this while his E is active, and AA refresh the debuff, but does not stack the damage. Consumes 5 charges of Negation.

R: Queen's Fate: CD: (180/160/120) Range: (1200/1300/1400)/(400/450/500) Passive: Every point you put into RK ult increases his Negation cap by 5, up to the max of 20. RK summons the casket of his beloved Queen at the target location, dealing AOE damage. Enemies in the area take (150/200/300) + 50% of AP magic damage, and acquire the debuff, Death's Vengeance. While under this, enemies take (5/7/9)% + 1% per 100 AP as magic damage, of their max health every 2 seconds for 4 seconds. Empowered R: If RK has 10 or more charges, his ult fears enemies away from the location, lasting (1/1.5/2) seconds, and increases Death's Vengeance duration to 6 seconds. Consumes 10 charges of Negation.