Lifebound Abomination (Lebensgebundene Abscheulichkeit) is located at 5130,7865. He roams around north of a building on The Academy grounds.
Gruddin is located near 4356,8859. He roams around a building in northwest part of The Menagerie.
Skinflayer (Hautschinder) is located at 4433,9149. He doesn't roam and is slightly southeast of Gruddin.