Related Hiisi Island Evermoon Seal And Treasure Vault Locations In Genshin Impact Opening the Hiisi Island Treasure Vault in Genshin Impact requires players to collect the Evermoon Seals on the Island. How To Solve The Jueyun Karst Water Puzzle In Genshin Impact Once the lake is completely drained of water, the cutscene will focus in on the door of the Taishan Mansion Domain, which is now glowing and accessible.