Fighter is a former Adventurer who was part of a porcelain-ranked party on a Goblin Slaying Quest. After the quest ended in disaster for her, she retired and left the Frontier.

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Image source: https://www.pixiv.net/en/artworks/105974603

Extra Goblin Slayer AU lore source:

https://x.com/melissa_hv2/status/1798781986217357623

https://x.com/melissa_hv2/status/1799363044403036228