Vonduun crab

Vonduun crabs were carnivorous crabs native to the remote planet Zav Alox. The Aloxians, the planet's native sentient species, were born highly aggressive. As a result, Aloxian children were sent to hunt the crabs at a young age, and if they were not eaten, would wear the crabs' skulls in order to temper their aggression. When the Aloxians eventually grew out of the skulls, they would break from the force of the wearer's head. The Patrolian Farks acquired a vonduun crab skull during the High Republic Era and gave it to the pirate queen Maz Kanata, who kept the skull in her castle on Takodana until it fell into the possession of the young Force-sensitive Aloxian Qort after he wound up there.

Text and facts from the “Vonduun crab” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.