A Gug.

Gugs are a race of horrifying giants. They are speechless, communicating only by facial expressions. The gugs were banished to the underworld by the earth’s gods, the Great Ones, for an unnamed blasphemy. Now they reside in a terrifying, underground city, dwelling in lofty, round, cyclopean towers. Nearby, colossal monoliths mark the cemetery of the gugs.

In the midst of the gug city, the Tower of Koth contains a stairway that leads to the Enchanted Wood in the upper Dreamlands. There it is sealed by a huge stone trapdoor with a large iron ring. Because of a curse of the gods, no gug may open that door, though no such restriction prevents a gug from climbing to the very top of the tower.

Gugs prey on the ghasts that live in the Vaults of Zin (though prior to their banishment, they had been known to devour wayward dreamers). When in sufficient numbers, ghasts may likewise prey on the gugs. Though gugs would seem to have the advantage, they nonetheless superstitiously fear ghouls. The gugs often indulge in great feasts and, once engorged, retire to their great towers to sleep.