Shadow Power

Shadow Power is a Defensive  skill in Diablo III.

In-game
Gives the Demon Hunter a Life per Hit bonus for a short time. The amount scales with character level, up to at level 70. Visually, the Demon Hunter gains wing-like tendrils of darkness.

Runes

 * Night Bane: when activated, the Demon Hunter slows the movement speed of enemies within yards by  for  seconds. Only affects enemies who were within that range at the moment of activation.
 * Blood Moon: The total Life on Hit granted by Shadow Power in effectiveness.
 * Well of Darkness: reduces the Discipline cost to.
 * Gloom: Reduces all damage taken by the Demon Hunter by  while Shadow Power is active.
 * Shadow Glide: While affected by Shadow Power, the Demon Hunter gains movement speed.

Non-rune enhancements

 * Elusive Ring (Legendary Ring): take 50-60% less damage for 8 seconds after cast.
 * Lianna's Wings (Legendary Hand Crossbow): Shadow Power also triggers Smoke Screen when cast.
 * The Shadow's Mantle Set (Set Bonus for 4 items): Shadow Power gains the effect of all runes at once and lasts infinitely.

Passives

 * Perfectionist: reduces Discipline cost by 10%.
 * Tactical Advantage: additional 60% movement speed after cast for 2 seconds.

Development
Before Patch 2.0., this skill used to grant 15% Life Steal, which was mandatory for endgame builds.