Rhea

Rhea, also known as Archbishop Rhea in Fire Emblem: Three Houses, is the supreme leader of the Church of Seiros and headmistress of the Garreg Mach Monastery. Her true identity is Seiros, the saint who defeated Nemesis over a thousand years ago. Rhea is a descendant of the goddess Sothis and one of the last Nabateans. She has conducted numerous experiments to resurrect her mother, including implanting Sothis's Crest Stone into human bodies. She was Jeralt's superior and continued to watch him even after he left the Church. Rhea plays a crucial role in the game, deeply influencing the narrative with her actions and objectives, and her motives and past are central to the plot's mysteries. Her relationship with the protagonist and her fate vary significantly in different story routes. She can be a vital ally or a formidable enemy, making her a complex and controversial character in the game.