Overview
Darsea (Chinese: 黛汐, Japanese: ダーシア, Korean: 다르시) is a Sovereign in the world of Honkai: Nexus Anima, governing the paired Aspects of Memory and Oblivion. She is the younger sister of Kumyo Kyo, the 4th Sovereign. Darsea is deceased and does not actively appear in the current build of the game, but her death has had lasting consequences that drive much of the game's narrative.
Death and Oblivios
After the Sundering, Darsea died under circumstances that remain unclear. Her death had major cosmological consequences: a disease called Oblivios emerged and spread across multiple Planes. Oblivios is an amnesia-like affliction that causes progressive memory loss in those it affects.
Connection to the protagonist
The player character recalls fragmented memories involving Darsea. In one fragment: "In my dreams, I vaguely recalled fragments of the Past: once, I traveled with Darsea and Parayaya. They were my friends..." This suggests the protagonist (revealed to be the World-Ender) had a deep personal connection to Darsea in a prior existence, before losing those memories.
Legacy
Darsea's brother Kumyo Kyo sealed the World-Ender within the Plane of Illusion to fulfill a promise he made to her, sacrificing himself in the process. The spread of Oblivios after her death remains one of the central problems affecting the game's world, and understanding what happened to Darsea may be connected to finding a cure.