EX Treasure: Ancient Mask

"EX Treasure: Ancient Mask" is a Side Quest in.

Overview
Link receives this Quest after obtaining The Master Trials DLC Pack. Misko's EX Journal can be found on a bookshelf at the southern wall of the southernmost building in the Outpost Ruins. In the Journal are clues to the locations of eight Treasure Chests, each containing a priceless relic stolen from Hyrule Castle by Misko. The Journal states that the ancient mask are at the ruins where soldiers gathered and the waters of Lake Kolomo can be seen. The Treasure Chest can be found buried next to the southeastern corner of the largest building at the Kolomo Garrison Ruins. The Treasure Chest can be pulled out of the ground using the Magnesis Rune. Once free, Link can open the Chest to receive the Majora's Mask, completing the Quest.