@KeiosKod It could be a spell? In dnd Druids can create berries that energize people as if a whole meal, and she seems to have healed Thistles head injury from her scratching herself.
So he made the deal with the winged lion to keep his king alive forever, and then trapped the lion in the book. But by then, the lion had consumed so much of his desire that he doesn't even remember much of anything.