little known fact is that Golarion has it's own legends about Frosty the Snowman which rose in the wake of an incident involving a lich using a fancy hat as their reliquary and things spiraling out of control from there.
Hey I ran a christmas one shot based on just such a Hat! It was wind-blown from an occult collector’s attic window, and then some kids used it exactly how you’d expect. The hat gave whatever it possessed a standard Lich’s spell list but adopted their physical form — in this case an Ice Golem.
After the heroes defeated it, the hat blew away again and landed on the Guard Captain. She branded the heroes as criminals, creating a ruckus of non-violent combats to solve their way through as the Captain ran off. When they caught up and tackled her - it blew away again.
The players followed it to the local anti-magical wizard’s asylum, where the hat itself tried to free whoever was the most powerful caster it could find while using the prison’s defences against the heroes. When they at last caught up and axed the hat, the Lich’s soul took on the form of a Mythic Fire Elemental.
Its skull became the ending yule log while the heroes’s collector friend gave them spooky gifts as a thanks!
