Sothis

THIS PAGE HAS MAJOR FIRE EMBLEM THREE HOUSES SPOILERS. Sothis is the goddess of Fódlan that was in Byleth's head years ago, that had the form of a young girl. She holds a major Crest of Flames.

Biography
Sothis descended on Fódlan years ago, living among the people. She created the Children of the Goddess to guide the people when she would leave. Her blessings were abused, and many attempted to capture and kill her, leaving Sothis spending a lot of energy defending herself. Her last child, Serios, was created when she passed away in the Holy Tomb.

Soon, the underground group Those Who Slither in the Dark broke into the tomb and took Sothis's Crest of Flames and granted it into their own. They used Sothis's bones to create the Sword of the Creator, and other weapons similar in power. Nemesis, the one who held the Crest of Flames was then killed by Serios, who longed to revive her mother.

Serios tried many times to find a host for Sothis and failed every time. Until one year... a child was born with no heartbeat, and Serios placed the Crest of Flames inside of her. She ended up being the perfect vessel. However, the girl's father fled, taking the child with him, leaving the whereabouts unknown...

One day, the girl, now older, has begun getting dreams of Sothis, who was unable to remember her origin. She grants her the power to use the Divine Pulse, able to rewind time to a certain point. She then continued to talk to her telepathically during her times at the academy.

When the girl was trapped in the void, Sothis granted her the full power of the goddess by fusing their souls. Her presence was now "gone", in the girl's soul forever...

Personality
Sothis can be seen as really bratty. She has a quirk of falling asleep and being tired a lot of the time, and irritation that she cannot remember her past. She does see herself as above anyone else, and requires respect from her host, despite the fact that in her state she is relatively powerless.

Trivia

 * Sothis, alongside Jeralt, is the only character in the CSR Lore that is "dead" at the star of narration. All other characters are seen on screen or still alive and mentioned.