Bartolomy's Portable Hatch

This object is a 24-square-inch hatch cover made of an unknown metal and weighs 10 pounds. As an action, you can place the hatch cover on any surface and it will magically adhere to it. The hatch then expands to a 5-foot-wide by 10-foot-tall doorway. When you open the door it leads to an extradimensional space. You and up to 10 creatures you designate may enter the doorway. You may cause the door to disappear but the surface it is on will still radiate a faint aura of transmutation magic if targeted by detect magic.

Inside the extradimensional space is a 20-foot by 20-foot room with 10-foot-tall ceilings. If you placed the hatch on a vertical surface, the entrance is on the side of the room. If you placed it on a horizontal surface, the entrance is on the ceiling with a staircase leading down into the room. The room is well lit and contains several empty shelves, tables, benches, and a small forge and anvil. The room is stocked with up to 5 sets of Artisan's Tools of your choice to craft or repair items. Objects created by this effect dissipate into smoke if removed from the extradimensional space.

The extradimensional space remains for 12 hours or until you dismiss it. When the effect ends, any creatures left inside the extradimensional space are expelled into the open spaces nearest to the hatch. Objects you bring into the extradimensional space will remain where you left them.

Items that create extradimensional spaces, such as a bag of holding, heward's handy haversack, or similar items can be carried into the extradimensional space the hatch creates. If left inside when the extradimensional space is dismissed, both items are instantly destroyed, and a gate to the Astral Plane opens. The gate originates where the hatch was placed. Any creature within 10 feet of the gate is sucked through it and deposited in a random location on the Astral Plane. The gate then closes. The gate is one-way only and can't be reopened. Placing or using Bartolomy's Portable Hatch inside an extradimensional space created by a bag of holding, portable hole, or similar item creates the same effect.

Notes: Utility, Container