Rage of the Keeper: Includes true damage. (bye bye Darius >:D)
Force of Nature: Increased Cooldown to 19/17/15/13/11 from 12/11/10/9/8. Changed to AOE path rather than a target.
Protector's Care: Active changed to negate the next instance of champion damage rather than providing a consistent buff.
Crippling Curse: Now reduces tenacity (able to reduce below 0, increasing duration) instead of percentage tenacity removal.
Wrath of the Keeper: AD and AP removal changed to stackable 20%/27%/34% instead of a full 100%. Reduced casting and bounce range. Increased cooldown.
Please do comment if you think this concept is overpowered or requires changing.