Excrucians

From Nobilis Wiki

The Excrucians, who come from the Lands Beyond, seek to undo reality by un-doing or "excruciating" its Estates. Every Noble, no matter their Estate or their Affiliations, seeks to stop the Excrucians. Excruciated Estates disappear from history as if they had never existed.

One of the factions involved in the Valde Bellum.