Since she's come up a few times int he past several days, Sonnorae has been on my mind. She's my favorite addition to the Golarion canon: The last descendant the Rae clan, a Varisian family dedicated to preserving knowledge and folklore in the post-apocalyptic hellhole that was the Age of Darkness. After several generations in that harsh climate, braving dangerous Thassilonian ruins and creatures roaming the eternal night, the clan dwindled to Sonnorae: a transgender woman unable to bear children and continue her legacy and unwilling to share her family burdeon with outsiders. Instead she used forgotten rune magic to cleave off a sliver of the realm of dreams and bind it into her Harrow deck, which she could use as a pocket dimension to store all her family's accumulated lore forever.
Sonnorae vanished mysteriously thousands of years ago, but her actions still affect modern Golarion: her experiment accidentally registered the Rae clan Harrow deck as the cosmic archetype, and over time all other Harrow decks warp to mimic her own.