Bound by Pain 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.)
Once inside the vault, you will see a broken lever. You need to repair it, and for that you need the lever shaft. Go to the Ancient Forge on the north of the island, forge a silver lever shaft with silver bar.
After the repair is done, the door still wont open. Use spirit vision to reveal spirit of the guardian of the door, Brother Kalvin. Talk to him and he'll open the door.
Inside you will find a chained Possessed Dwarf. For max XP you need to kill the demon and save the dwarf. For that first you need to expel the demon out of the Dwarf's body. Hit the dwarf until he stops getting knocked down, at this point the demon has left the dwarf's body. After that destroy the pillars to free the demon and the dwarf. Kill the demon to complete the Quest.
Divinity 2 Act II Quests Playlist: https://www.youtube.com/playlist?list=PL_l3PEDN9zYj9WK8OJr9tDF5W1i-3q3xr
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