Sword of Conveniant Sanctuary
Weapon (any sword), rare (requires attunement)
The steel blade of this sword is engraved with three heraldic castles, while the grip is wrapped in blue leather with a rainbow moonstone set at either end of the cross-guard. You gain a +1 bonus to attack and damage rolls made with this weapon.
While wielding this sword, you can use an action to cut open an entrance in mid-air to an extradimensional space. This space can hold as many as eight Medium or smaller creatures. Attacks and spells can't cross through the entrance into or out of the extradimensional space, and you can seal the entrance from inside using a bonus action. Once the entrance is sealed, those inside can see out of the space as if through a 3-foot-by-5-foot window, but they themselves are completely invisible and inaccessible to those outside.
The extradimensional space lasts for 1 hour or until you use a bonus action to destroy it. When this happens, those who were inside appear in the unoccupied spaces nearest where the entrance was originally cut.