Orthrus

This article contains unmarked spoilers for Book 4.

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“How is something the size of the goddamned bubble only level 10? Seriously, will he die if I punch him in the leg?”^[1]

Orthrus is an adorable, floppy eared, impossibly massive two-headed puppy that was pulled into the Nothing after his former master, Emberus's son Geyrun, was murdered.^[2]

AI Description

Orthrus. Juvenile Gate Guardian. Level 10.
This is a bereft pet of Geyrun.
Who’s a good boy? Who’s a good boy?
When you see a multi-headed dog trained to guard gates, you probably first think of Cerberus, the three-headed monstrosity that is said to protect one of the stairwell exits on the twelfth floor. What you probably don’t know is that grumpy Cerberus has a kid brother who is still learning the ropes.
Orthrus. The most loveable hell-hound on this side of Alpha Centauri. The left side is for sniffin’ and the right side is for lickin’ and that pink belly of his?
It’s for kissin’.
If this lil pup was any more sweet and adorable, you’d all be inflicted with diabetes.
The universe’s goodest boy was originally destined for a fate like that of his brother. But before the two-headed Orthrus could get turned into a vicious, baby-eating, nun-defiling murder machine, he met with some bad luck. First, his master was murdered, and then he got sucked into the Nothing, all on the same day.
Unlike most creatures who have been touched by the Nothing, Orthrus’s pure innocence causes him to be unaffected by the blight. Fire doesn’t do a thing, which is good considering his adopted family. But unlike most gods, he is not invulnerable. He is but a little puppy. Happy, but destructive. Rambunctious, roly-poly, very pokey. But fragile.
Which is unfortunate. His master may be dead, but his master’s father, Emberus the Fire God, is not. He would not be pleased if anything were to happen to his dead son’s best friend.^[3]

Story

After Carl engages the Gate of the Feral Gods on the Fifth Floor, Orthrus breaks free from the Nothing and crashes right into Bubble 543. His appearance triggers the quest, Where the Red God Glows Quest.^[2]

References

↑ Dinniman, Matt. The Gate of the Feral Gods (Chapter 29) (p. 448). Dandy House. Kindle Edition.
↑ ^2.0 ^2.1 Dinniman, Matt. The Gate of the Feral Gods (Chapter 29)
↑ Dinniman, Matt. The Gate of the Feral Gods (Chapter 29) (pp. 447-448). Dandy House. Kindle Edition.