Quria

Quria, Blade Transform is a Vex Mind and Hydra created to conquer Oryx's Throne World and learn the Sword Logic that governed it. Oryx Taken Quria, left it some free will, and gave it to his sister Savathûn to study. Savathûn taught Quria Hive magic, and by simulating Oryx, Quria learned to Take others. That let it command the Taken and create new ones.

In Season of the Splicer, Quria built the Endless Night over the Last City after the Clash of the Chosen. Kell Mithrax traced the night to Quria and Savathûn, and the Guardian destroyed Quria's domain at the heart of the Vex Network with Mithrax's help. See also the Splicer seal.