[Champion Concept] Grudd, The Thunder Ape

I've never suggested one of these before and don't feel I know enough about champion stats to put all the numbers, but I'm sure riot could handle that much. Excuse the lack of preparation and detail, but criticism and suggestions are welcome.

Grudd is a tanky fighter. Give him a mace on a chain for one of his hands (pretty neat idea I know.) I'm feelin like he should be white or gray, and as the title suggest has the power of lightning and thunder.

[Passive] Charged Attack: Each consecutive auto attack generates a charge on his opponent. After 4 consecutive attacks lightning discharges and deals a little extra damage and strikes up to 3 nearby enemies. Or once fully charged his next ability causes the discharge.

[Q] Thunder Flail: Grudd smashes a target area dealing AoE damage to enemies and stunning anyone in the center of the blast. [W] ROAR! : Grudd roars and its really scary. thats it. Jk I'm thinking maybe a fear or slow or increasing his attack and movement speed. [E] Leap: Grudd launches himself at a target enemy, dealing damage to nearby enemies. [R] Rampage: Grudd beats his chest and channels a lightning storm overhead rapidly striking and causing damage in the area.