The damage reads as "XX% Reduction to Enemy's Health" and it reduces the target's current health by the given percentage. The effect dimishes as the target loses it's health.
The following skills use this type of damage:
- Spirit Mastery: Deathchill Aura, the Liche King's Spectral Bolt (standard attack) and Death Nova (synergy skill), and the Outsider's Ether Strike special ability
- Nature Mastery: Plague and the Wolves' Maul attack and the Nymph's bow attack
- Hunting Mastery: Take Down
- Warfare Mastery: Doom Horn (synergy skill to War Horn)