The Thing on the stairs is a creature created by Trevor Henderson.
Appearance
It skin is white, It’s eyes are missing, It has red lips and sharp teeth. It’s hands have 4 sharp fingers, and it’s cheeks seem to be ripped apart. It is unknown what the rest of it looks like. It’s nose is also missing. In the caption, the person describing the creature says that it is walking to the hallway, and then mumbles to itself as it walks down the stairs. Mumbling means it is capable of speech, so this creature may be non-hostile.
Source
https://mobile.twitter.com/slimyswampghost/status/1127052681560850432
Created By Trevor Henderson