Theia was confused. She wasn't the brightest mind out there, but even she could tell that Reeva didn't belong to any cult.
Her first impression of him wasn't great—at least, she thought that was Reeva. A dark cult member had approached her, saying she had a talent for mysticism. She didn't know who to trust, but at that moment, a voice came from her family treasure, telling her to go with the cult member.
She followed the black rectangular artifact, which led her into a cult. She successfully joined them, and they provided her with all the components necessary to construct a star as her foundation. The cult member then conducted a ritual on her.
The process was excruciating, involving a lot of pain and suffering. She couldn't even sleep when she first formed it. However, her intent carried her through the process. She wanted to help her sister, and that desire stayed true for the longest time.