This creature is a large grayish-black rat about 2 feet long.
Ethereal Rat CR 2
XP 600
N Small magical beast
hp 11 (2d10)
Melee bite +4 (1d4-2 plus ethereal poison)
Base Atk +2; CMB -2; CMD 9 (13 vs. trip)
Feats Weapon Finesse
Environment underground
Organization pack (6-11)
Treasure none
Ethereal rats, like normal rats, they can be found just about anywhere.
Ethereal Rat from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene.