A 4-Dimensional mirror is a new usable item added in version 1.42 of Elona+. They can be found randomly in dungeons or bought from general vendors. They have a variable amount of charges and can be recharged with scrolls. They weigh 9.0s.
Using t on the item invokes the 4-dimensional pocket spell and consumes one charge of the item. The effect is functionally identical to using the spell, however, the mirror's ability is not connected to the spell level, and up to 50 items that do not weigh over 40s can be moved with it (equivalent to casting the spell at level 35). 10 stamina is consumed each time an item is added or removed from the 4th-dimensional space, and it connects to the same 4th-dimensional space as when using the spell.