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Moving, attacking and casting builds Energy stacks. At 100 stacks, your next attack heals you, grants increased Movement Speed, and restores mana or energy if you attack a champion. At 100 Energy stacks, your next attack gains 40% Attack Speed.

Heal: 15 - 110 + 15% bonus Attack Damage + 10% Ability Power

Movement Speed bonus: 20% for 1 second.

When attacking a champion, restore 8% missing mana or 8% missing energy.

Heals for 35% (Melee) / 15% (Ranged) when attacking minions or monsters.