Tomb of Grallyx
From Jenny Everywhere Wiki
The Tomb of Grallyx was an ancient monument which was retconned into the fabric of one universe when one Jenny Everywhere shifted into the body of her local incarnation, an adventurer-archeologist type, while taking Lord Grallyx with her. The centerpiece of the Tomb was a sarcophagus resembling Grallyx's original physical form. (PROSE: Jenny Everywhere and the Lord of Hell)