The rancor was a terrible creature hidden in a shadowy chamber beneath Jabba the Hutt's throne room. A towering hulk of muscle and reptilian flesh, the rancor walked on two stubby legs and had disproportionately long arms to capture prey. Dominating its flat face was a salivating tooth-filled maw. Its armored skin was so tough that the beast could slough off blaster bolts as little more than annoyances.
The rancor served the dual purpose of not only amusing Jabba, but also disposing of unwanted servants, musicians, or anyone else the Hutt would want to get rid of. With a shout of "Boska!" Jabba would activate a secret trap door in front of his throne.
Located beneath the throne room of Jabba's palace, the rancor pit was an underground chamber with a viewing grate that opened to allow Jabba and his depraved audience a glimpse of the gruesome proceedings.
When Luke Skywalker was dropped into the rancor pit, he defended himself against the beast using the leg bone of a previous victim. Skywalker outmaneuvered the rancor, luring the creature back into its retaining chamber. With a well thrown skull, Luke activated the chamber door just as the rancor stepped underneath it, bringing the door slamming down on the creature's head.