Cerberus

"Named for the mythical guardian of the gates of Hell, this two-headed firebreathing demon abides in a dark, sulfurous den, hidden to the world of mortals. Ferocious and nigh invulnerable, Cerberus is the deadliest adversary you will face aside from Tchernobog himself. Remember that you must destroy both heads in order to defeat him."

- Blood manual.

The Cerberus, also refered as "The Lord of All Nightmares" from the Cryptic Passage expansion, is a two-headed dog-like beast as well as the third boss at the final level E3M7: The Pit of Cerberus of Episode 3. It is later encountered in E4M8: Hall of the Epiphany, the last level of Episode 4.

In Extra Crispy, the Cerberus can be also encountered in E4M7: In The Flesh of Episode 4.

Description
Cerberus is a large, canine-like beast with two heads each sporting with red eyes and sharp fangs. It sports with shaggy brown fur as well as claws. It has few wounds from both sides.

Involvement
Coming soon.

Official bestiary
The guardian of the gates of madness is a two-headed, fire-breathing, gut-chomping mastiff. By the time you reach its domain, rest assured that it will know of you and be ready to tango in the worst way. Remember that two heads are better than one--and you'll have to deal with both.

Trivia

 * Cerberus is named after the Greek mythogical monster of the same name.
 * Although from the actual myth, the Cerberus possess with three heads rather than just two.
 * Cerberus' appearance could actually based on the two-headed dog Orthrus from the Greek mythology.
 * The name "The Lord of All Nightmares" may be a reference to the Lord of Nightmares from the Slayers franchise.