Wondrous Item

Uncommon

As a bonus action, a spellcaster holding the crystal can absorb the mana within the crystal, provided they have access to the type of spell slots.
The crystal replenishes 2 levels of spell slots. (Meaning: a lvl 2 spell slot | 2 lvl 1 spell slots.)
If the caster is at their maximum spell slots, the regained slot exists as a temporary spell slot and lasts for 5 minutes before dissipating.

After being used, the Mana Crystal becomes an Empty Mana Crystal (small) , losing its glow and light coloration.

Cost: 100 Gp
Weight: 1 lb.