Adamantine shoals were lifeforms inhabiting the magma surrounding the Ancestral Retreat of the Shu-Torun royalty on the planet Shu-Torun. During the War on Shu-Torun in 0 ABY, Queen Trios sought shelter within the Ancestral Retreat. When Imperial agent Morit Astarte inquired about the palace's defenses, Trios explained that the revered adamantine shoals circled it, maintaining its peaceful nature for millennia.
The seventeenth issue of the Star Wars: Darth Vader comic book series from 2015 featured adamantine shoals. Kieron Gillen wrote the issue, which Marvel Comics released on March 2, 2016.