Pact between Santa Claus and the Great Higher-Ups
From Jenny Everywhere Wiki
There existed a pact between the Great Higher-Ups of the 925th Universe and a powerful, eldritch Santa Claus who controlled hundreds of Santaforms. On Christmas Eve 2022, the Great Higher-Ups sent the Man in Grey to Claus's tower to renew the pact, something to which the deity acquiesced. (PROSE: A Very Jenny Over-There Christmas)