Ravenous Earth [one-action] (concentrate, earth, unholy) With a single, devious thought, the urglid causes a mound of grave soil to well up at a creature's feet. That creature must succeed at a DC 30 Reflex save or become restrained (Escape DC 30). The restrained creature then begins sinking below the ground into a spontaneously formed grave. A creature restrained by this ability for 3 rounds is buried 6 feet deep in the ground and begins suffocating within 1 minute. A buried creature must be dug up to be freed (see Burial). A creature that is slain by Ravenous Earth rises as a ghoul the next midnight.
This ability has no range, temporary immunity, or incapacitation trait, allowing the urglid to use it three times per turn, from any distance, even against the same PC, even against higher level PCs, as long as there is at least one PC not restrained by grave soil.
This might still be balanced due to the DC being moderate, but it still seems strange enough to potentially warrant errata.