Cerberus

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

Appearance
In the Web Novel, its a giant dog whose long tail reminded one of a dragon. It has three heads, and three pairs of fiery eyes.

In the Light Novel, Cerberus has possesses a tail ending in a venomous snake.

Abilities
It is classified as a 10th-tier summoned monster.

In the Light Novel, besides its physical characteristics, Cerberus is a high ranking magical beast, as it can add fire damage to all its attack, and is fully resistant to fire and poison. Also it is a beast-type monster with high detection abilities due to its three heads.

Trivia

 * Cerberus is the name of a beast in Greek mythology that guards the gates of Hades.
 * 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.
 * Cerberus can be summoned using Statue of Magical Beast - Cerberus.
 * In terms of level a Cerberus loses against a Fenrir.
 * When Momonga wore the Robe of the Immortal Seeker, Tabula Smaragdina compared him to looking like Cerberus.