Direct answer
Follow the hidden tomb’s descending switchbacks and stone-door corridor to the end sarcophagus. One Ancestral Star is placed here. Parts of the route remain unconfirmed; prior looting and refresh in the current save still need checking.
Gunther’s Ancestral Weapon: Conditions and Hidden Tomb

Result
Follow the hidden tomb’s descending switchbacks and stone-door corridor to the end sarcophagus. One Ancestral Star is placed here. Parts of the route remain unconfirmed; prior looting and refresh in the current save still need checking.
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