Chaos Temple
From Stormhalter
The portal to the Underkingdom lies in the north-west corner of the Harper Woods, and the old Yasnaki settlement and temple inhabit most of the rest of the area. The town itself is overgrown, but still a few remnants of the old order may be found wandering around, those who managed to hide deep within the woods when the Muian Thaumaturges came through and eradicated the brotherhood. Deep in the temple to the west is where the order performed many of their greatest experiments.