Muglumps were large, deadly creatures that were frequently found inhabiting the Mire and, to a lesser extent, the Sewers of Undertown. They often posed a threat to creatures and convoys trying to cross the area to reach Undertown. Preying on anything that crossed their domain, muglumps moved underneath the surface of the mud, sliding stealthily toward their prey before bursting up and attacking with their characteristic "bone-scraping screech". They frequently hunted in packs.