A gug’s most horrid feature is its barrel-shaped head, which splits vertically to reveal numerous rows of sharp, yellow teeth and an open throat. Its eyes on either side of its head-jaw are small but keen. Bony ridges protect its eyes from the frantic flailing of its prey, as it prefers meals of raw and writhing meat over fungi and molds. It grips said prey with powerful arms that split at the elbow into a pair of forearms, giving it four clawed paws. These monstrous brutes are covered with shaggy black fur, often crusted with blood and gore.
Although gugs may seem bestial, they have keen and wicked intellects. Gugs lair far underground, but they sometimes come to the surface to hunt during dark nights, either alone or in small groups. As they possess voracious appetites, most gugs consume the creatures they catch, but some instead kidnap their victims and retreat below the surface, leaving only a lingering stench and odd, clawed paw-prints. Victims are taken to rancid lairs marked with strange runes and sacrificed to the gugs’ wicked gods of blood, darkness, and nightmares. Dire rumors tell of lightless gug cities made of titanic blocks of stone far underground, where powerful gug leaders preach their vile doctrines to mobs of howling gugs.
Gugs have a strange relationship with ghouls, which seems to date from their shared origin in a distant subterranean world. Gugs live in fear of ghouls, despite towering over them; however, this strange fear doesn’t apply to ghasts, whom gugs consume as voraciously as they do other creatures.
Gugs stand 16 feet tall and weigh 2,000 pounds, although they have an eerie, graceful gait that belies their immense size. Their light step and ability to squeeze through very small crannies makes gugs common bogeymen in tales of strange disappearances or bloody massacres.
Some particularly bloodthirsty gugs gain awful powers as gifts from their eldritch patrons. These monsters are known as savants, are never less than 12th level in power, and gain several occult innate spells. Though each savant’s precise mix of spells varies, normally, these spells grant invisibility, offer power to manipulate and change rock, or invoke awful and destructive energies upon living flesh.