Quria, Blade Transform
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Quria, Blade Transform, also known as the Dreaming Mind, is a Taken Vex Axis Mind Hydra. Manifested by the Vex in order to understand and conquer Oryx's realm and the Sword Logic within it, it is now a powerful Taken commander under Savathûn, the Witch-Queen, having mastered the power to Take through its simulations of Oryx..
The Vex first encountered the Hive when Crota, Son of Oryx used his sword to cut open a portal to another region of space, in the hopes of gaining a secret power. Savathûn had tricked Crota into choosing that location; the region Crota accessed contained Vex, who were able to enter the Ascendant Realm of Oryx directly. Initially, the Vex were perplexed by the unique physics of the realm, physics of Oryx's own creation designed to allow the strongest entities within it to rule and attain divine power, i.e. sword-logic. Seeking a solution, the Vex manifested a new Axis Mind, Quria, Blade Transform, who was able to unravel the enigma of sword-logic and thereby allow the Vex to adapt to Oryx's ascendant realm. Quria's solution was simple: in order to gain power in the realm, the Vex needed to kill everything within it.
Soon the Vex were manufacturing powerful new models specialized for combat, which wreaked havoc among the Hive and consequently became even stronger. Oryx's children Crota, Ir Anûk, and Ir Halak, destroyed many Vex using an Annihilator Totem, but were unable to seal the portal to Vex space shut before Quria built a device to hold it open. For a century, a stalemate between Vex and Hive endured; neither race could leave their origin space to attack the other without becoming too weak to inflict any lasting damage.
Eventually, Quria captured Worm larvae for experimentation and discovered that worshiping the Worms allowed the worshiper to alter reality slightly. As a result, it created a Vex priesthood to worship the Worms, and then began capturing and killing increasingly dangerous organisms to bootstrap itself to divinity in accordance with Hive sword-logic. For unknown reasons, Quria refrained from integrating a Worm with Vex mind fluid.
War with Oryx
Summoned home by the Worm God Eir, Oryx cleared his realm of Vex, defeating Quria's limited tactics and forcing the Mind to retreat for a time. Quria did not attack the Hive again until Oryx had built his Dreadnaught and used it to destroy the Harmonious Fleet Invincible and raid the Nicha Thought-ship. As Oryx boarded the ship, Quria ambushed him in force. Upon attempting to simulate and understand Oryx, however, Quria was stymied, as Oryx had become too complex and powerful for even the Vex to fully comprehend.
Quria realized that it could not overcome Oryx and faced certain defeat. As Oryx and his forces cut through the Vex, Quria resorted to making a partial simulation of Oryx that encompassed only his original form, Aurash, as Quria could not accurately measure Oryx's current form and power. Quria projected the simulation of Aurash at Oryx to gain any insight it could. Fascinated, Oryx briefly spoke with the simulated Aurash, and Quria contextualized their dialog with a Taox-simulation retrieved from a gate in former Ecumene space. Quria's last act before Oryx took it was to send the information it had gathered to the rest of the Vex network, knowing the other Vex would devote their resources to finding a solution to the Hive.
A Gift for the Witch-Queen
Afterwards, Oryx gifted the Taken Quria to Savathûn so she could study it, explaining how it had simulated Aurash. To this end, he'd left Quria with a modicum of free will so that it might simulate further surprises for her. In reality, Savathûn secretly engineered the creation of the Taken Vex Mind to aid in her schemes of challenging the Sword Logic itself. To that end, she teaches Quria Hive magic as a computational oracle to solve unsolvable problems; Including navigating a singularity with which to evolve her Hive beyond the dependency of their Worms.
The Red War
After the Red War, Taken forces led by Ir Arok, Tongue of Quria and others titled after Quria appeared on Io, and attempted to subvert the Vex collective at the Pyramidion. Their efforts were stopped by the Guardian.
According to Toland, the Shattered, who was encountered by the Guardian within the Ascendant Realm while exploring the Dreaming City, Quria has obtained the power to Take; its powers of simulation have apparently been enhanced as a result of its Taken status, allowing it to successfully simulate Oryx in his entirety and thereby learn how to Take for itself. This essentially confirms that the Taking of Vex witnessed on Io by the Guardian was performed by Quria itself and by extension, Savathûn.
Upon the death of Riven, the last Ahamkara, Quria's mastery of simulations traps the Dreaming City in a never-ending 3-week cycle tied to the death of Dûl Incaru, the Eternal Return; the cycle of the Taken curse was able to affect the whole City with the fidelity of a Vex simulation as a result of Riven feeding upon the Guardians' collective wish to save the city.
Posing as the craftmind Medusa, Quria apparently reached out to The Guardian in a Vex simulation, as part of a series of communications transmitted to the Guardian via encoded Glimmer. It begins to fully explain the plans of Savathûn and that it had achieved the Vex's desire to simulate the Light. However, the simulation then proceeds to seemingly collapse on itself due to it being an illusion by Dûl Incaru. In spite of this, the process reverses itself until the role of the narrator eventually reaches Eris Morn a second time. Because of this, it is unclear whether or not the real Quria had ever appeared to the Guardian at all.
List of appearances