The power relay vault was the name given to one of the vaults built by the Rakata species in the Tomb, an ancient prison on the planet Belsavis. Located in the abandoned Rakata machine chamber, the vault was the site of several power relays that supplied the stasis generators throughout the Tomb, and so when the Esh-kha were released from imprisonment during the invasion of Belsavis, they attempted to destroy the relays and free their brethren. The vault's computer intelligence recruited nearby individuals to secure the vault and activate the emergency relays.