Stone Circle (Illusionist structure)

The illusionist is a really cool mob but there isn't really a good (already existing place) for them to be implemented properly, so I propose a structure called the stone circle. Stone circles could generate in dark oak forests and swamps and be composed of 3 to 5 standing stones of stone and andesite in a ring. Illusionist could spawn in these structures. When you encounter a stone circle with an illusionist in it a sort of mist could set in for a more atmospheric battle.