The Terrace, which is this race that's been subjugated. They store a bunch of like cultural knowledge and records of events through for Rukami and other magics. So over the course of the book it is revealed that the Lord ruler who has ruled over this this world for actually like a thousand years does have command over both forms of magic even though for Rukami is not really well understood among the general populace. "I can't tell if it knots because there are a couple moments in each like so she has a vignette vindas ha ha"