Wondrous Item, rare
Arcane Crystals are a further refinement of an Arcane Focus, serving to help the wielder amplify a particular aspect of the magical power they channel. Arcane Crystals do not require an attunement slot, but you can only equip a maximum of one Arcane Crystal equipped at any one time.
When you cast a spell, you gain 1d8 temporary hit points, up to a maximum of 15.
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