Ziggurat

The Ziggurat is a structure below Whitestone. The Briarwoods seized Whitestone and prepared the Ziggurat for a ritual in service to Vecna. The Briarwood letters mention a manse inside the Ziggurat.

At the top of the Ziggurat is a strange, hovering black orb that sucks in anything that touches it and disables all magic within a specific radius.

The Ziggurat was used as a war council room by Vox Machina and their allies in Whitestone, as the magic-syphoning orb prevented any Scrying or other magical means of spying on their plans.