Fiends

Fiends, the Corrupted of Kah'ne
Fiends are the dark half of the two races which derived from the Primarchs. Most Fiends worship or pledge their allegiance to Kah'ne and as a result, thrive on violence, chaos, pain, trickery and other negative things. Torture, even between Fiends, is a frequent reality. As Fiend culture has developed, some have taken to worshipping other deities, mostly notably Adsel, the matron of the dark and secrets.

Power and Abilities
In order to better serve their ends, most Fiends have developed skills and abilities they did not have as simple Primarchs. Fiends usually have some mix of great physical strength, durability, regenerative ability and magical ability. Fiendish magic consists of magical methods of destroying, inflicting pain, frightening, confusing, tricking and a wide array of other negative uses.

Appearance
As they grew deeper in their devotion to Kah'ne and the ideals she represents, Fiends changed physically. Many of them developed dark skin (either red or black), horns of various shapes and sizes, hooves and claws and a number of other animalistic traits.

Home Location
The Fiends control the underground on the Primarch plane. Tunnels, caverns and caves protect them from the Celestials who control the air. Like the Celestials, the Fiends control about half of the surface area of their plane with their areas of control shifting with victories and losses in battle.

Military
Fiend society is entirely militaristic. Rank and position are law among Fiends, so much so that even the Fiends that thrive on Chaos know when to back down when commanded by a superior. Rank is awarded based on a number of things, chiefly cruelty and skill in battle. Ranks range from lowly Fiends created solely to serve other Fiends to the ten great High Warlords who lead the armies.

Reaching Incantre
While it is rare for a Fiend to be strong enough to travel between the planes on his/her own, there are a number of known ways for it to happen. Fiends can be summoned from their plane by common races who have been corrupted, they can have been sent here as part of an effort by a group of magically powerful Fiends or they could have been given permission by the military elite to take the way which has been kept open since the corruption of the dragons. Other ways are possible but far more difficult.