Herd Skulker 2014
CR 1 monstrosity
Medium monstrosity, neutral evil
Has advantage on Dex (Stealth) and Cha (Deception) checks to blend into herd or convince those observing herd it is part of the herd.
Has advantage on Wis (Perception) checks that rely on hearing or smell.
A domesticated herd animal such as a cow horse sheep or chicken that can see the herd skulker treats it as a member of the herd regardless of the form skulker takes. When such an animal sees a herd skulker attack or feed it becomes immune to herd skulker’s One of the Herd for the next 24 hrs acting as it normally would when confronting a predator. Creatures immune to the charmed condition are immune to this.
Bonus Actions
Transforms into a Large or smaller domesticated herd animal it can see such as a cow horse sheep or chicken or back into its true canine form. Its statistics other than its size are the same in each form. Reverts on death.
Takes the Disengage or Hide action.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details