Amethyst Die

This gaming die is carved from a fragment of powerful psionic crystal and resonates with a remnant of its power.
This die has 3 charges and regains all expended charges daily at dawn. When you make an ability check, attack roll, or saving throw, you can expend 1 charge to roll a d6 and add the number rolled to the d20 roll. Immediately after the ability check, attack roll, or saving throw is resolved, you take psychic damage equal to twice the number you rolled on the d6.

After returning from their fateful expedition, two members of the Amethyst Knife used the shattered remains of the crystal dagger to forge psionic items for themselves.
Harlo Honeygrin carried the amethyst die, and Victory wielded mindrazor.