Wisdom Gem

Games	Phantom Hourglass
Location	Various places throughout the World of the Ocean King
Uses	Upgrading the Spirit of Wisdom
Related	Courage Gem; Power Gem

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Wisdom Gems are items in Phantom Hourglass. Link uses these gems in order to channel more power from the Spirit of Wisdom. They are scattered all across the World of the Ocean King, and Link can find a maximum of 20 Wisdom Gems. Upgrading Neri at 10 Wisdom Gems is the equivalent of acquiring the Blue Mail — it reduces Link's damage by half. Upgrading at 20 gems reduces his damage to one quarter like the Red Mail would in previous titles. Also, if Link has a shield, it allows him to stun weaker enemies if they run into it.

In-depth guide:
Phantom Hourglass Wisdom Gems Guide

Inventory	Boomerang Bomb Bombchu Bow Grappling Hook Hammer Shovel
Equipment	Sea Chart Oshus's Sword Phantom Sword Wooden Shield Cannon Salvage Arm Fishing Rod Big Catch Lure Cyclone Slate Bomb Bag Quiver Bombchu Bag
Quest Items	Phantom Hourglass Sword Blade Crimsonine Azurine Aquanine Sun Key Ghost Key Regal Necklace King's Key
Collection	Heart Container Treasure Map Sand of Hours Power Gem Wisdom Gem Courage Gem Prize Postcard Jolene's Letter
Trading Sequence	Hero's New Clothes Kaleidoscope Guard Notebook Wood Heart Swordsman's Scroll
Treasure	Treasure Pink Coral Pearl Necklace Dark Pearl Loop Zora Scale Goron Amber Ruto Crown Helmaroc Plume Regal Ring
Dungeon	Small Key Boss Key
Potions	Red Potion Purple Potion Yellow Potion

Games	Phantom Hourglass
Location	Various places throughout the World of the Ocean King
Uses	Upgrading the Spirit of Wisdom
Related	Courage Gem Power Gem