No rent

No Rent ("NO RENT") indicates that an item will disappear from your inventory or bank shortly (about 30 minutes) after you logout. It is applied to all player-summoned items, as well as various other items in the game (including most A shadowed man drops).

If you wish to keep a No Rent item after logging out, you must leave it on a corpse. Because of this Plane of Sky raiders often leave a corpse with their (NO RENT) keys after every raid, and the first island of that zone is full of such "key corpses".