Rat Prophet

The Rat Prophet is a creature that lives underneath the Theatre and is able to visit the player in their dreams. It is able to see the future, but often tells lies. It visits Katerina at night and influences her prophecies. It appears before the three healers: the Bachelor, the Haruspex, and the Changeling.

Description
"One of the obscure figures whose power lies in their inherent contradiction. Based, of course, on the Rat King—yet there are no rats in Pathologic 2! A demon, a chthonic “thing from below”, he defies expectations by being from the Theatre and not the Steppe. More of a dweller of the underside of Kain’s enlightened world. That’s why he may sometimes “break character”, letting us see that he’s no magical creature—just a child (or dwarf?) wearing a mask."

- [from the game’s design documents]

Pathologic 2
During the 'death sequences' of Pathologic 2, where the player is punished with "failure" by waking in the Theatre to speak with Mark Immortell, a stage hand notes that a 'rat escaped the theatre'. Upon returning to the Town, the player may meet the Rat Prophet outside of the Theatre, observing the tumour in the earth - a large skeleton, shaped like a bull, that begins to grow from the ground. It seems that this growth increases in size with every "failure" of the Haruspex. The Haruspex can dismiss the frustrations of the prophet or take it into consideration.

As the Town grows unsteady with the outbreak, a mob stands outside the Saburovs one day and declare they are responsible for housing a carrier of the plague. Later, Changeling speaks with the Haruspex, requesting that he pay her adopted parents a visit to make sure they are well. When the Haruspex speaks with Katerina Saburova, she reveals to him the source of her visions, which take the form of the Prophet. It berates the ignorance of humans before evicting the Haruspex from Katerina's abode.