Truthseeker was a Quoth.
It was created by its fellows to find the source of the madness they called the Blight which was afflicting their people. Truthseeker mistakenly killed a large group of Quoth who it thought were suffering from the Blight. Following this, it was renamed Warleader and was commanded to commit War against the Blighted Clusters. When the Blight was finally eliminated with Montague's death, it received its final new name, Blight-Ender. (PROSE: The Death of Art)