League of Legends Reforged Rune: Conqueror

Basic attacks on-hit against enemy champions grant (2 for Melee / 1 for Ranged) stacks of Conqueror. Abilities and spells that deal damage to an enemy champion always grant 2 stacks.

Each stack of Conqueror grants 1.2−3 bonus Attack Damage or 2−5 Ability Power for 6 seconds (depending on level), stacking up to 12 times, for a maximum of 14.4−36 bonus Attack Damage or 24−60 Ability Power (depending on level). When fully stacked, heals for (9% for Melee / 6% for Ranged) of the post-mitigation damage dealt to enemy champions. The buffs refresh upon dealing damage to enemy champions with attacks or abilities.

Persistent damage and ongoing sources of damage will grant the stacks / refresh them only once every 5 seconds. Spells and effects that deal default damage will not grant any stacks.