Find 7 Stone Slates across Tsurumi Island to receive two Luxurious Chests and the Hidden Achievement "Seven Letters" : r/GenshinImpactTips
Hidden Chest you DEFINITELY MISSED at Seirei Island | World Quests and Puzzles |【Genshin Impact】 - YouTube
Sportskeeda Genshin Impact on X: "All 4 locations to find Large Rock Piles with Hidden Chests in Watatsumi & Seirai Island Destroy the rock pile near Suigetsu pool to get two #Inazuma