Saving the Historian in Gargoyle's Maze - Divinity: Orignal Sin 2
The poor fellow will be in one of the areas of Gargoyle's Maze. Once you reach it there will be a fight with some undead. Once you kill them you can now try to save the NPC in the center of the Arena.
After that follow these steps:
Create a blood pool - via Blood Rain, Flesh Sacrafice or hitting your companion.
Teleport the Historian on it. Or you can create blood pool in his position
Once the fire disappears use skill Bless. There will be a Source puddle near by to get points for casting the skill
After this you will be able to talk with him: