Felkin are sentient beings with the abyssal taint somewhere in their bloodline. How and why this comes to occur is not known.
Felkin usually bear an unnatural scar somewhere on their bodies, but can also exhibit more outlandish features such as vestigial wings, horns or tails and black nails, teeth or eyes. Most felkin have some innate sorcerous ability which is derived directly from the abyss, and can be a blessing or a curse. These abilities vary widely.