Filth Golem
In Jewish folklore, a golem (/ˈɡoʊləm/ GOH-ləm; Hebrew: גולם) is an animated anthropomorphic being that is created entirely from inanimate matter (usually clay or mud). The word was used to mean an amorphous, unformed material in Psalms and medieval writing. The most famous golem narrative involves Judah Loew ben Bezalel, the late-16th-century rabbi of Prague. This closely mimics reality, whereupon magical casters infuse their essence or that of a spirit into matter of some kind, forming an anthropomorphic object. Golems can be used for good or ill and have little or no mind of their own, relying on their creator for guidance. In the case of your average golem, if their creator is slain, the golem will revert back into the materials from which it was constructed. However, demonic golems, the kind bound to the will of a demon lord or a dark god, the creature needs no input from an outside master, obeying the direct will and commands of the evil being whose spirit animates it from the Outer Darkness.
Filth Golems are golems infused with the power of Nergal, the Babylonian and Mesopotamian god of disease. Formed from filth of any kind, this monstrosity has very high endurance due to the generally slimy, viscous nature of the materials forming it. They will spread potent spiritual, magical corruption from their touch, the very same corruption that Bo Wyatt endured. Absinthe Van Gothen found a Nergalite Cultist in the sewers of Portland, specifically the Big Pipe Project. Having been sealed off from Roy and Molly McCoy, Abby faced the dark priest alone and managed to defeat him. However, he fell into the sewer sludge- the final sacrifice Nergal needed to finish his binding and the demonic filth golem rose from the nasty glop. Fighting for her life, Absinthe narrowly managed to destroy the filth golem and it splashed back into nothing more than grime and goo.