Cerberus

Cerberus (ケルベロス) is a summoned monster from YGGDRASIL.

Appearance
A giant dog whose long tail reminded one of a dragon. It had three heads, and three pairs of fiery eyes.

Abilities
In the Web Novel, it is classified as a 10th-tier summoned monster.

Trivia

 * Cerberus is the name of a beast in Greek mythology that guards the gates of Tartarus.
 * In the Web Novel, Ainz Ooal Gown uses an unknown scroll to summon this creature to devour the delegation from the Re-Estize Kingdom after he found their attitude towards his abode insolent.