Countering-Hp Stack
An item that does extra damage based on the enemies max hp (or even current!).
E.G
GlovesX - +200 mana, +1% Damage (of opponents Max HP).
So this would give +70 damage to a UB with 7k hp and would do only +20 damage vs a 2khp Reg.
Of course figures can be changed (0.8%, 0.2% - whatever).