This small misty white gem, when the trigger word is spoken, will magically absorb and steal the power of the intended target (be that humanoid, creature, or item)

This particular gem can hold the total power of a level 2 caster, stealing all their spell slots in the highest 2 levels they have.  It can drain the magic from a medium or small magical creature (as long as they do not possess legendary actions) and will render items rare and below useless.  For items rarer than rare, or larger creatures, this gem has no effect.

 Once filled with its capacity of magic, the gem turns a misty violet.  It will store the power until the command word is spoken once again, with the intent to release, and will return the magical energy back to its original source.

Multiple gems can be stacked and used on a target, but must be used at the same time.  For example, to completely steal a level 6 casters power, 3 of these gems would be needed simultaneously.

The gem can only be broken by a magical melee weapon and has an AC of 22 and has 35 hp.  Upon breaking the gem, the magic is returned to the original owner.

It is currently unknown if it is possible to transfer magical ability through this gem, but has been deemed as impossible by those who discouvered them.