Naberius is a Vestige, also known as the Grinning Hound, presented in the Tome of Magic (3rd ed). Some think he may be an aspect of Cerberus, the three-headed hound who guards the gates of Hades.
Source: Tome of Magic (D&D 3.5)
...Jink makes the planes go round, the planes go round, the planes go round...
— Popular Merchant song
