The Mirror of Holding

The Mirror of Holding looks like an ordinary hand mirror, roughly 12 inches in diameter. When the correct activation phrase is spoken, the mirror opens a portal into a 10 foot by 10 foot by 10 foot extradimensional space.
The portal randomly appears on the walls, ceiling, or floor of the space. Objects must be small enough to pass through the mirror in order to be placed in the space. Objects end up where ever they happen to land in the space. In order to retrieve objects, the characters will have to use a grappling or some of other contraption to reach the items.
The only light available is that which passes through the portal. If a living being is some how placed in the space, adequate air is available but food and water must be placed inside the space. Time flows at the normal rate. Beings inside the space cannot teleport nor become ethereal to escape. But abilities similar to Plane Shift will work.
If the mirror is destroyed then access to the space is lost. The fate of anything within the extradimensional space is a mystery.

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