Hyperbolic Time Seal

This seal is a pretty simple idea while complex in design, perhaps Athos' best creation, next to the Abyss Seal.

When this seal is placed upon the door of a room, the room is enters another state, compared to the rest of the world. This room becomes inaccessible from the outside, regardless of any attempts that may be tried. Once sealed inside the room, one day in the real world equals that of a whole year inside the sealed room. Only the person who placed the seal has the ability to remove it.