Boosts the power of moves by ~30% (5324/4096), but at the cost of 10% max HP each time the holder uses an attack. Life Orb does not damage the holder if the holder has Magic Guard, has Sheer Force and uses a move boosted by the Ability, or when the power is not boosted by the Life Orb. It does not boost the damage for moves that deal direct damage, self-inflicted confusion damage or recoil.
In Generation IV, it does not cause damage to the holder when hitting a substitute.
If stolen with Thief or Covet, the Pokémon that used that move will lose HP.