Jessica Cruz was forced to become the unwilling host to the Ring of Volthoom after Power Ring's death. Though technically she is not a "Power Ring" as she is not a member of the Crime Syndicate and has no association with the organization, for namesake purposes she is dubbed "Power Ring" while the ring uses her as a host. She is helped by the Justice League and Simon Baz, who help her understand her cursed powers. Immediately afterwards, a Green Lantern ring descends at the battlefield and transforms Jessica, whose courageous act proved her to be capable of overcoming great fear, into a new Green Lantern.
When the Central Power Battery of Oa was destroyed, Jessica Cruz found herself stranded on a Lantern station in Sector 123. Cruz lived on the station alone and powerless for over a year, as she learned to use the station's communications systems, allowing her to guard the Sector as a watcher and advisor. When members of the Sinestro Corps sought to steal the station's supplies and convert it into their base, Cruz fought them without a Ring. She both overcame great fear and instilled it in her enemies, earning herself a Yellow Lantern Ring.
Using Lyssa Drak's ring, Jessica traveled to New Korugar, where Thaal Sinestro welcomed her to the corps and assigned her to Sector 2814. Reluctant, Jessica accepted the ring, and she found herself doing her first mission as a Yellow Lantern when she saved a space cruiser on collision course to Earth's moon. Afterward, she officially earned her Power Battery, and accepted her new job.
Current Version:
Green Lantern
Former Version:
Power Ring
Yellow Lantern