Jørn was a somewhat unexpected hatchling of Eldri's gryphon Jonna and a feral gryphon who lived in the neaby woods. Eldri was familiar with this gryphon because she had seen him around several times when roaming the forest, so she named him Jeger. He was rather wary of people but not as much of other gryphons, so as Jonna was allowed to roam on her own, she got to bond with him. Once she laid an egg, Jeger started trying to approach Jonna's people and became more friendly, but would still rather be off on his own, delivering food for Jonna from a distance (food that she didn't really need because she was a pet but he was trying to be a good gryphon dad).

When Jørn was born, Eldri cautiously introduced the hatchling to Seir, who immediately adored the little ball of fuzz. He would spend hours in Jonna's pen watching the baby, just waiting for when it was old enough that he'd be allowed to pet it. So when Jørn opened his eyes and started moving around, Seir would play with him all the time, take him on walks or just have him nearby while he read books. It was clear to Eldri that this was to be Seir's gryphon companion now, and so she taught Seir how to train his gryphon for eventually becoming a flight-mount. Seir became a little gryphon nerd, and Jørn became his best friend forever.