Perhaps one of the most frightening creatures ever to live inside the Overneath is the Demon of Woe. Even feared by some demon clans, he is capable of forcing his victims to relive the most agonizing moments of their lives repeatedly, and as if they were at fault for them. Most who encounter him ultimately succumb to madness. He dwells in total darkness and like other Aternals can travel through places where light cannot reach.

Kendro Valladão witnessed the unrelenting mental illness and self-destruction of his now departed twin brother, not knowing then that the Demon of Woe was behind it.