Spoiler warning: Plot or ending details follow.

"The royal family of Hyrule collected historically significant outfits, but they were stolen by a bandit named Misko. Among the items stolen was some phantasmal armor. There's a journal that places the location of the treasure somewhere in the Outpost Ruins..."
— Adventure Log

EX Treasure: Phantasma is a side quest from The Legend of Zelda: Breath of the Wild. It is unlocked upon installation of the DLC Pack "The Master Trials". It requests Link to find and read the Misko's EX Journal at the Outpost Ruins. The quest guides Link toward the "phantasma" treasures, three new Treasure Chests containing the "Phantom Equipment". The treasures containing the Phantom Helmet, Armor and Greaves are respectively buried in the northwest of the Coliseum Ruins, the southeast of the Sacred Ground Ruins, and the southeast of the Hyrule Garrison Ruins.

Spoiler warning: Spoilers end here.

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