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Metamagic rod, Empower, lesser

(Dungeon Master's Guide v.3.5, page 236)

Price (Item Level): 9,000 gp (12th)
Body Slot: — (held)
Caster Level: 17th
Aura: Strong; (DC 23) no school
Activation:
Weight: 5 lb.

You can cast up to three spells per day, of 3rd level or lower, where damage is empowered as though affected by the Empower Spell feat.

Prerequisites: Craft Rod, Empower Spell.
Cost to Create: 4,500 gp, 360 XP, 9 days.