How to get revenge on the spirit in the quest, which gives a log in a sawmill? (Divinity: Original Sin 2)

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avtorklif
Kesti
At the sawmill Parking lot between the elves and the lone wolves(there's still a bunch of traps and stuff, all poured on the ground), you need to find the grave of this superintendent, to dig a grave will appear spirit, absorb spirit, and to talk again with the tree.