The mortiwraith was a creature which typically lives in the dark, due to the fact that light activates the toxins in their blood, killing them. However, upon occasion, they are able to live in moonlight and sunlight. (E.G., Timera.) The mortiwraiths are generally peaceful unless provoked.

Their greatest family member is Falon, a gigantic mortiwraith, mother of nearly all mortiwraiths in the Realm. Falon sacrificed herself to kill the Wyrm Lord in The Final Storm.