This article contains spoilers for the Fleeing Phoenix case.
Usha is an undead Mayan priestess who got revived by Joseph Hill to learn where the entrance to Cthygonnaar was.
Reed first meets her when going to Hill's apartment, and has to defend himself against her. Once she is temporarily defeated and goes away, Hill tells him about her. According to Hill, Usha was once the keeper of the Seal and still protects the path to Cthygonnaar. She kills people and drinks their blood to become stronger.
When Reed tracks her down, he finds his way to a flooded lab where he finds out that Usha has been tortured by Hill and his employee Raymond Archer]], in order to discover how to get inside Cthygonnaar. Despite the torment, Usha didn't reveal anything because Hill is not a Seed. She managed to escape and attacked Hill and Raymond. Hill fled, and left Raymond to deal with her on his own.
Reed encounters her again through Raymond, who she uses as a vessel. She reveals that she will tell him the secrets of Cthygonnaar if he kills Hill. She wants freedom and revenge on Hill but can't do this herself.