Orb
Cost: 20 gp
Weight: 3
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.
Credits: SRD 5.1