Cinderheart is a ThunderClan warrior that has served under Firestar's, Bramblestar's, the impostor's, Squirrelflight's, Lionblaze's, and Graystripe's leaderships in the lake territories. She was born to Sorreltail and Brackenfur at the exact moment Cinderpelt died at the claws of a badger, and named after the medicine cat who sacrificed herself for Sorreltail and her kits. As Cinderpelt died, her spirit transferred to the newborn Cinderkit. She was apprenticed as Cinderpaw to Cloudtail, but before passing her warrior assessment, she broke her leg after falling from the Sky Oak. Leafpool was worried that she wouldn't be able to be a warrior like Cinderpelt, but the young cat recovered and earned her warrior name, Cinderheart. She mentored Ivypool and fell in love with Lionblaze, but when she learned about the Kin of Your Kin prophecy, Cinderheart believed she would distract Lionblaze from his destiny. Furthermore, after Jayfeather revealed to her that she was once Cinderpelt, Cinderheart believed she must return to being a medicine cat, but Jayfeather convinced Cinderheart that she can choose her fate. Finally, Cinderpelt's spirit left to StarClan and she became mates with Lionblaze. Cinderheart mothered his kits, Hollykit, Sorrelkit, and Fernkit, and later Snapkit, Spotkit, and Flykit. She also mentored Finchpaw and was exiled by Bramblestar's impostor before later returning to ThunderClan under Squirrelflight's leadership.