Felhunters (also known as felbeasts, felhounds, and the hounds of Hakkar) are magic eaters that feed on arcane energy, an energy that fel energy is counteracted by. The volatile arcane energies—the lifeblood of a nascent titan— are the energies of the Twisting Nether, an astral dimension separate from the physical universe, and so these hunters presumably reside in the Twisting Nether, searching for arcane energy to feast upon, or travel in-between the Twisting Nether and the physical universe.