World of Warcraft®

You restore 20% of your total health after you kill a target in Demon Form that yields experience or honor.

Requires Demonology.

Teaches you the ability Dark Apotheosis.

Dark Apotheosis
You imbue yourself with demonic energies, reducing physical damage taken by 13.85%, reduces magic damage taken by 15%, and allows the use of various demonic abilities.

In addition, Soulshatter becomes Provocation which taunts your target, Twilight Ward becomes Fury Ward which will absorb all schools of damage, Shadow Bolt becomes Demonic Slash, and Fear becomes Sleep.

Your Corruption spell will heal you for 0.5% of your maximum health when dealing damage.

Your Felsteed and Dreadsteed can cross water while running and leave a trail of flames.

If you use Demonic Leap while falling, you slam into the ground rapidly and will not die from falling damage.

Your Felguard will equip a random two-handed axe, sword or polearm from your backpack.