Castle of Siegling is the infernal version of the château of Silling from the Marquis de Sade’s novel Les 120 Journées de Sodome: a floating castle within the second circle (Lust). It was first mentioned as the “Castle of the Apocalypse”.
It contains the four libertines, the four wives, the storytellers, the folladores (“fuckers”) and sixteen captive children (eight girls and eight boys). Its structure includes halls, bedrooms, a chapel, a dining room and the libertines’ rooms.
It is a subspace within the territory of the Castle of the Prism: the group infiltrates it, then escapes through the Bifrost to the Castle of the Prism proper.