Zombified reindeer. Perhaps to be called rancid reindeer, twisted tundrawalker, rotten rudolph, or horn-y sledpuller.
The description:
It’s quite possible that this used to be a reindeer that got bitten by a zombified mall Santa, causing it to turn afterwards into this abomination. A dented jinglebell dangles from one of its eyesockets, making a faint sound every time it moves, giving away its location if you were to listen closely in the silence of the night. Shredded scorched red ribbons hang from its partially shattered bloody antlers, together with torn-off hair and other subtle evidence of human remains. Its teeth are now pointy sharp, as if they were the teeth of an apex predator. The sound that this creature intermittently emits is inhumane, as if it was stuck in a slow dying process, while still being fully aware of it. Still, its deathly demeanor disguises its barbaric ferocity, and this creature should be taken with all seriousness. There are numerous small bitemarks on its partially decayed body, but also a set of large ones. Whether it was the children, the mall elves, or the wildlife doing the biting, it is certain that they’re all zombified now, and possibly still nearby. Chupacabra would s**t bricks.
And now for some made-up totally real quotes:
“In the despair of the Christmas eve, you are not alone, for loneliness is a luxury that you will not be granted.” --all relatives ever
“Torment thy neighbors as you yourself wish to be tormented.” --zombie jesus
