World of Warcraft®

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 and Shadow Bolt becomes Demonic Slash.

Your Shadowflame slow is increased to 70% but Hand of Gul'dan no longer has charges.

Teaches you the ability Imp Swarm.
Requires Demonology.

Imp Swarm
Summons 5 Wild Imps from the Twisting Nether to attack the target.

The Wild Imps passive effect is disabled while Imp Swarm is on cooldown. Imp Swarm's cooldown is reduced by spell haste. Also increases Wild Imp's cooldown by 4 sec.

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 Eye of Kilrogg is no longer stealthed and can now place your Demonic Circle.

In addition, the movement speed of your Eye of Kilrogg is increased by 50% and allows it to fly in areas where flying mounts are enabled.