Underground Castle

A castle discovered deep in the tunnels beyond the bugkin colony, visible through a rear entrance of an Ankeg egg chamber. Activity moves around the distant structure — unmistakably cult business.

The party recognized this fortress as part of the slow-dawning geometry of cult activity scattered across the Wildermarch — a constellation of sites they've been stumbling through for weeks. They sealed the tunnel leading to it for now, understanding they were not equipped for that confrontation.

Confirmed by the Aboleth: The subterranean fortress houses the bulk of the Cult of the Whispering Stars' forces, making final preparations for the unification. The Aboleth does not normally dwell there but can reach it via the large body of water adjacent to the structure — an ongoing waterway connection to the deep. The time, Silas warned, is nigh.