Yugg

The Yuggs, a.k.a. Yuggya, and sometimes referred to as "the Burrowers Beneath" or "Worms of the Earth", are a subterranean amphibious worm-like alien species which were present on Earth in the prehistoric continent of Mu, prior to its sinking. Their leader and progenitor is Father Ubb, a.k.a. the Father of Worms.

Biology
Yuggs are white and slimy creatures that resemble oversized worms or sea slugs and are known to inhabit both the ocean and humid underground locations. They are strong enough to capture Humans and drag them over the side of a boat.

Yuggs can communicate by telepathy with Humans who have been in close proximity to them, as these people will be able to hear the Yuggs' voices inside their heads.

The Yuggs' progenitor, Father Ubb, has been described as a putrescent gelatinous white creature with a squat body, a swollen round head and a drooling pink-rimmed mouth with triple rows of adamantine fangs.

Culture and society
The Yuggya are servants of the Xothic gods Ythogtha and Zoth-Ommog, sons of Cthulhu. According to Ythogtha's priest Zanthu, the Yuggya "squirm and slither in the slime about [Ythogtha's] feet" and "tirelessly gnaw at the bonds that hold Ythogtha and Zoth-Ommog" in a futile attempt to free their lords from the Elder Gods' prison.

From their subterranean lairs the Yuggs have access to enormous quantities of precious gems and metals, which they offer to Humans in exchange for sacrificial victims.

Appearances

 * "Out of the Ages", by Lin Carter (1975)
 * "The Horror in the Gallery", by Lin Carter (1976)
 * "The Thing in the Pit", by Lin Carter (1980)
 * "The Winfield Heritance", by Lin Carter (1981)
 * "Behind the Mask", by Lin Carter (1987)
 * "The Soul of the Devil-Bought", by Robert M. Price (1996)