Akronos, War's Avatar

So this is the second champion concept I've done on this site, so here it goes!

Lore: Chaos ensues, the fight is in full swing, as soldiers from both sides fall to arrows, axes, swords and magic. Then I saw it. Our prayers have been answers as Akronos, the Avatar of War marches across the battlefield, destroying our foes in his wake. When I saw his might I stood still, taking in the destructive power that we had wrought. Alas, I was still for too long, and an arrow hit me square in the chest. As I fell, I could feel my spirit being taken, absorbed into the monster, and became one with it. I now know the true meaning of fighting. I am one of many. I am the Avatar.

Abilities: Passive: War Rages On- Whenever a unit dies near Akronos, he gains 10% AD and MS; this stacks up to 3 times. This bonus is doubled for champion deaths.

Q: Obliterate- Akronos smashes his mallet in front of him, dealing 75/100/125/175+(80% AD) damage and stunning for .75/1/1.25/1.50/1.75 seconds if the target is in the center of the cone. (.3 second wind up time) (9/8/7/6/5 second CD and 60/65/70/75/80 MC)

W: Merciless Throw- Akronos launches 3 spears like 's Q but with a slightly more narrow spread. Each spear deals 100/125/150/200/250 damage+(50% AD). These spears pierce units, for every unit pierced the damage is reduced by 10% to a max of 50%. (The spear are about as fast as 's spears. (15/14/13/12/11 second CD and 90/100/110/120/140 MC)

E: Battering Ram- Akronos gains a shield equal to 10/12/14/16/20% of his max health+(30% AP) for 8 seconds. (20/19/18/17/16/15 second CD and 100/110/110/120/120/125 MC)

R: Heavy Weapons- Akronos fires his catapult at 3000/3500/4000 range and deals 150/200/250 damage in a semi-large area that deals damage to minions and structures and burns them for a total of 75/125/175+(50%AP) damage over 3 seconds. (150/120/100 second CD and 100/150/200 Additionally, Akronos passively gains size and stat boosts 5/10/15% Max Health increase 10% AD increase Abilities have a 10/15/20 increase in AOE Statistics: I'm not to good with these, so I'd say around the same stats as or . Obviously any help with these would be much appreciated, thanks!

Role: Bruiser/Tank

Look: An amalgamation of weapons and shields and armor put together to make a large monster with swords and flags jutting out of its back. Its left hand leads to a large, metal, mallet. The right hand is a large cleaver-type weapon. Three spears are lodged in his cleaver arm, and are launched when his W is used. Akrono's head is a large metal mask with literal dagger teeth.

Thanks for any constructive criticism!