5e SRD:Arcane Focus, Crystal
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Arcane Focus. An arcane focus is a special item–an orb, a crystal, a rod, a specially constructed staff, a wand-like length of wood, or some similar item–designed to channel the power of arcane spells. A sorcerer, warlock, or wizard can use such an item as a spellcasting focus.
Cost: 10 gp
Weight: 1 lb.