Fics like Seven Realms of Ishgar

Princess Heartfilia was raised to die, isolated by her Elven kingdom as the next centennial sacrifice to seal an ancient, spreading darkness. Armed with twelve star-forged keys, her mother’s mysterious pendant, and a desperate desire to change her fate, Lucy escapes on the eve of her twentieth birthday and plunges into a vast world of Realms she's never known. On the run, she crosses paths with Natsu Dragneel, a Dragonborn who becomes an unexpected ally... and perhaps more than either of them ever intended. The seal is weakening, threatening to swallow all, and a continent built on the deaths of Heartfilias must now face the most dangerous of all: her survival.

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