Tattoo of Holding

This tattoo is a dark line running the length of your forearm, crossed by short perpendicular lines at every inch along its length. You can open the tattoo to reveal an extra-dimensional storage space capable of holding up to 100 pounds, not exceeding a volume of 7 cubic feet. The contents do not affect the weight of your arm beyond a vague sense that it is slightly heavier than your other arm when the tattoo is not empty. Storing or retrieving an item from the tattoo requires your action, and it cannot be opened by any creature other than you.

If the tattoo is overloaded or damaged from within, the tattoo ruptures and you take . This destroys your arm and scatters the tattoo's contents in the Astral Plane. The tattoo also ruptures if your arm is severed, though you don't take any additional damage beyond whatever caused the injury. If the tattoo is opened and held upside down, its contents spill forth, unharmed. Breathing creatures inside the tattoo can survive up to a number of seconds equal to 60 divided by the number of creatures, after which time they begin to suffocate.

Placing the tattooed arm inside an extra-dimensional space created by a bag of holding or similar item (or putting such an item inside the tattoo) will have catastrophic results. Both items are instantly destroyed, causing you to suffer as your arm explodes. A gate to the Astral Plane then appears, centered on your location. Any creature within 10 feet of the gate is sucked through it to a random location on the Astral Plane, then the gate closes. The gate is one-way and can't be reopened.