Ioun Stone of Agility
This deep red sphere increases your reaction time and quickness.
Head Slot 225,000 gp
You gain a +4 item bonus to Dexterity-based skill checks and Dexterity ability checks. You also gain a +5 item bonus to the damage rolls of Dexterity-based attacks.
Published in Mordenkainen's Magnificent Emporium, page(s) 70.