Concept: A mage who uses their magic to fly through the air for weeks on end until they make it to the moon, where they disintegrate tunnels and pathways and chambers all throughout the moon's core in a manner similar to an anthill. At the center of the moon, they hollow out a space the size of a large bedroom, and carve the sigils required into the interior, establishing the moon itself as their phylactery. It would take a loose DM, but I could see see spells allowing survival in a vacuum.








