Senna can absorb Mist by attacking souls that spawn from dead enemies. She can also siphon Mist from enemy champions she hits twice within a 4 seconds, dealing 1.2% of their current health as bonus physical damage (6 second cooldown per target). If not attacked, souls nearby Senna will be absorbed automatically on disappearance. Each stack of Mist grants 1.25 Attack Damage. Every 20 stacks of Mist grant 15 Attack Range and 15% Critical Chance.