Ioun Stone of Insight
This iridescent blue sphere hones your instincts to a fine edge.
Head Slot 225,000 gp
You gain a +4 item bonus to Wisdom-based skill checks and Wisdom ability checks. You also gain a +5 item bonus to the damage rolls of Wisdom-based attacks.
Published in Mordenkainen's Magnificent Emporium, page(s) 70.