Nethrim

Nethrim are creatures that are made of, or significantly tainted by, nether. Some are made up completely of nether near its natural form, such as shades, spectres, and wraiths. Other creatures considered nethrim are constructs animated by nether, such as ghouls, revenants, liches, and golems. Also included in the category of nethrim might be imps, fiends, and demons, which are speculated to be made up completely of nether in a more solid state.