The Silent One Quest (Divinity Original Sin 2)
You get the quest by entering into one of the three vaults hidden beneath the Blazing Sculptures in the Bloodmoon Island.
To open the statue, you need to let one character with Scholar tag to decipher Ornate Hymnal, it turns to The Taming of Holy Fire. This book can be found at multiple locations, including the archive on the northeast of the island, a Black Ring member near the tree & at Jahan's House.)
Use spirit vision to reveal spirit of the guardian of the door. Talk to him and persuade him to open the door.
Inside you will find a chained possessed girl. You need to talk and persuade a cat nearby to be able to talk to the girl. If you are unable to persuade the cat, simply kill it. After that interact with the possessed girl and teleport her to lady vengeance to cure her later.
Divinity 2 Act II Quests Playlist: https://www.youtube.com/playlist?list=PL_l3PEDN9zYj9WK8OJr9tDF5W1i-3q3xr
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