As Kalath moves further down the pit and draws closer to the rat-thing, it becomes clear it is a demon of some sort, though a bestial rat-like demon. It has horns and small wings and a barbed tail, but is otherwise a giant rat.
As Kalath moves closer the rat-demon sees him and hisses violently at him, its fur bristling. It does not charge or attack, but it is clear that if Kalath wishes to move any further down the ledge he will have to deal with the monster somehow.