Senna

Innate - Weakened Soul: Senna's basic attacks on-hit and abilities mark enemy champions hit for 4 seconds. Subsequent attacks or ability hits against marked targets will consume the mark to grant Senna a stack of Mist and deal bonus physical damage equal to 1% – 10% (based on level) of the target's current health, rendering the target immune to being marked again for a few seconds. This damage applies life steal at 100% effectiveness.

Innate: Enemies that die near Senna may spawn a Mist Wraith from their corpse. A Mist Wraith lasts 8 seconds and Senna can basic attack or hit it with Piercing Darkness or Dawning Shadow to kill it instantly, granting her 8 and a stack of Mist.

• Enemy champions and large monsters will spawn a Mist Wraith.
• Epic monsters will spawn 2 Mist Wraiths.
• Minions and lesser monsters that Senna kills have a 5% chance to spawn a Mist Wraith.
• Large minions that Senna does not kill will always spawn a Mist Wraith, while lesser minions and lesser monsters that Senna does not kill have a 32% chance to spawn one.
• Lesser minions executed by an allied champion's Support Quest item have a 8.4% chance to spawn a Mist Wraith.

Mist: For each stack of Mist, Senna gains 0.75 bonus attack damage. For every 20 stacks, she also gains 20 bonus attack range and 10% critical strike chance. Additionally, every 1% critical strike chance in excess of 100% is converted into 0.35% life steal.

Innate - Relic Cannon: Senna's basic attacks on-hit deal 20% AD bonus physical damage and grant her 10% / 15% / 20% (based on level) of the target's movement speed as bonus movement speed for 0.5 seconds. The damage applies life steal at 100% effectiveness.

Active: Senna fires a beam in the direction of the target unit. The beam consists of a wider ray of light, and a narrower ray of shadow at the center.

The shadow ray deals physical damage to enemies hit and slows them by 15% (+ 15% per 100 bonus AD) (+ 7% per 100 AP) for a duration. The damage dealt to enemy champions applies life steal at 100% effectiveness.

The light ray heals Senna and allied champions hit.

Piercing Darkness is considered to trigger a single basic attack against turrets, wards, jungle plants, Mist Wraiths and any other attack-interactive units hit. It also applies on-hit effects against champions and turrets hit, and triggers on-attack effects against one champion hit.

Piercing Darkness' current cooldown is reduced by 1 second on-attack.

Active: Senna throws a globule of Black Mist in the target direction that deals physical damage to the first enemy hit and attaches to them for 1 second.

After the duration or when the target dies, the Black Mist spreads out of the target, rooting them and surrounding enemies for a few seconds.

Active: Senna shrouds herself in an aura of Black Mist and gains camouflage for a duration. If Senna breaks the camouflage, she regains it after 1.75 seconds without performing actions that break stealth.

Allied champions who enter the mist gain Wraith Form for a duration equal to the aura's remaining duration.

Wraith Form: Gain camouflage. Enemies are granted obscured vision of camouflaged Wraiths moving outside the mist within their line of sight. Wraith Form can be regained if lost by breaking the camouflage after 1.75 seconds without performing actions that break stealth. Wraith Form ends immediately upon Senna's death.

Senna and allies camouflaged by Curse of the Black Mist also gain 20% (+ 5% per 100 AP) bonus movement speed.

Active: Senna fires a massive beam in the target direction. The beam consists of a broad wave of light, and a narrow wave of shadow at the center.

The shadow wave deals physical damage to enemy champions hit and reveals them for 3 seconds, as well as hits all Mist Wraiths.

The light wave grants a shield to Senna and allied champions hit for 3 seconds, and grants sight of the area along the path for 2 seconds.