Fics like Aerys III the Horrendous or the Great.

Hiccup dies in his home world during the battle against the Red Death. However, God has other plans for him, and Hiccup is reborn in the world of Ice and Fire as Jon Snow. Soon, Toothless is reborn as well, joining him in this new land. This is the beginning of a new adventure for Hiccup and Toothless as they navigate a new world, eventually rising to become kings.

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