|Region||Lands of Purity|
|Symbol||stiletto with a smoking blade|
Thieleth is a clandestine group serving Roongutil. They spy on and commit sabotage against the Har'kish. The main goal of Thieleth is the destruction of the Eye of Gith. It is not uncommon for this group to hire non-githzerai to battle the githyanki and to make forlorn attempts at sabotaging and destroying installations on the Eye of Gith.
In 1442, they established a base of operations at an ancient citadel called Eastern Shar. They held this place for a little more than a decade. After the Athenian Crusade (1539 - 1551), they established a new headquarters at Muzratân.