A homunculus, plural homunculi, is a type of undead construct so lifelike so as to be undetectable, even by undead-hunting experts such as Lilian Voss. Homunculi speak in coherent thoughts, and their skin is well-preserved. However, when sliced open a green liquid pours out of their bodies. The dreadlords of the Burning Legion started to use them during the Third invasion of the Burning Legion to infiltrate their enemies, in reaction to the demon hunters' ability to detect demons in disguise. Despite this recent use, they are not a recent invention: homunculi have been known to Azeroth since at least as far back as the First War. Kirin Tor doctrine frowns upon making homunculi, but some such as Khadgar understand the principles involved in creating them.
- A homunculus (Latin for "little man") is a term referring to humans created via alchemy. They first appeared by name in the writings of Paracelsus.
- There are homunculi in Karazhan, though they were described as demons they presumably follow the same rules.