Treasure Map 01 - Duchess Mansion - [Ring of Anti-Silence]
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Treasure Map 02 - Castle Resteed (North-Eastern Section) - [Ice Plate]
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Treasure Map 03 - Lake Serene - [Ring of Intellegence]
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Treasure Map 04 - Location: Azure Falls (Enter from north and then take west road over bridge between two waterfalls) - [Medallion of Protection]
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Treasure Map 05 - Location: Mountain Road - [Ring of Strength]
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Treasure Map 06 - Location: East of Gabe the Horseman's house - [Sun Lance]
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Treasure Map 07 - Location: Docked Ship (the ship you got to Frozen Continent on, just south of Solheim) - [Inferno Armor]
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Treasure Map 08 - Location: Shiva Path - [Tremble Robe]
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Treasure Map 09 - Location: Temple of Moon - [Frostbite Plate]
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Treasure Map 10 - Location: Stone Valley - [Ring of Dexterity]
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Treasure Map 11 - Location: Outside the Tomb of the Pharaoh - [Thunderstorm Robe]
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Treasure Map 12 - Location: Monastery (Divine Isle) - [Shadowstorm Dagger]
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Treasure Map 13 - Location: Shipwreck Island - [Medallion of the King]
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Treasure Map 14 - Location: Stonehenge (North side) - [Avalanche Plate]
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Treasure Map 15 - Location: Festival Island (Warp area) - [Portrait of Naluna]
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Legendary Map - Location: League of Perverts - [Beta Electrocute]
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It seems the treasure mas arent needed, the digging equipment is sufficent enough to get the treasure, if the location is known