Ashen Claystone of Aegis  

 

I was killing everything in the Crumbled Sanctuary per a friends recommendation and killing the Hynids and Cragbeasts outside. The Crumbled Sanctuary is a small temple to the east and slightly south of the main temple in the west. While I am always skeptical of the "any of them can spawn" it statements I can say that the Enslaved Vrex Zealot popped in the southern most room but it was not the spawn that Goods mapped had marked. It was the one in the middle.