Grasp of the Undying

Effect

Passive: Entering combat generates 1 stack every second for the next 3 seconds, refreshing the duration with each instance of combat and stacking the effect up to 4 times. At maximum stacks, your next basic attack on-hit within 5 seconds against an enemy champion consumes all stacks to deal bonus magic damage equal to 3.5% / 1.4% of your maximum health, heal you for 1.3% / 0.52% of your maximum health), and permanently grant you 5 / 2 bonus health.