The only shelter they have during Dark After, is Heart's Blood's body, so they crawl into her birth sac. In the morning, Jakkin and Akki are reborn out of the dragon blood, and became the first real human Austarians, linked to each other and Heart's Blood's five hatchlings.
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https://en.wikipedia.org/wiki/The_Pit_Dragon_Trilogy
Specifically, book two:
The only shelter they have during Dark After, is Heart's Blood's body, so they crawl into her birth sac. In the morning, Jakkin and Akki are reborn out of the dragon blood, and became the first real human Austarians, linked to each other and Heart's Blood's five hatchlings.