Lleth'adrezzar is a dark elven forest kingdom located in the Free Lands, south of the forest of Orglen across the River of Mirrors. The forest that Lleth'adrezzar inhabits was once considered part of Orglen until it was seized by the dark elves, claiming it as their rightful land.
The elves of Lleth'adrezzar were responsible for enticing the Nightblight towards Orglen in the 900s IaC. Their rituals disfigured and tortured a young Nightseeker, eventually driving her to flee and later attempt to right the injustices she faced as a child, in her own twisted way.