The Soul Seal in Female Dorm God's possession had quite the amusing backstory.
While exploring the starter village, he stumbled upon an old fisherman and struck up a conversation. The old man was the village church's priest, who spent his free time fishing. Unfortunately, nine out of ten times, he came back empty-handed, and the rare exceptions were bizarre finds—like corpses or magical beasts. For him, this was standard fare.
The priest believed himself cursed and poured out his grievances to Female Dorm God. Naturally, he didn't take the old man seriously, dismissing his woes as a lack of fishing skills. As an experienced angler himself, Female Dorm God decided to show off and help the priest with his fishing.