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It seems as if the protagonist is very easily forgiven for all the horrible things he's done. At most, the only "good" thing he accomplished was punishing Alexander, and maybe saving Agrippa. It wasn't as if he was trying to conquer or destroy the world if he'd succeeded, no-one except Daniel would've suffered from it.

He has already tortured all of Alexander's prisoners to death in order to keep the shadow at bay, and preventing Alexander from passing through the portal doesn't save anyone else by that point, Alexander had all the vitae he needed and just wanted to go home. My only question is: in exactly what way has he atoned for his sins? The only one he's saved by his actions is himself. Spoiler alert: At the end of the game, if you push over the three unstable pillars and thereby kill Alexander, the ending thereafter states that Daniel has atoned for his sins.Also, since he was obviously really torn up about that the fact that he realized he was a Complete Monster, he probably wasn't thinking in a terribly logically. Giving himself the potion made him forget the actual murders (minus the one you have to re-do near the end in a flashback), making it so that he knew what he had done, but couldn't remember, saving his sanity and allowing him to function. He was traumatized by the memory of what he had done to the point that he almost could not function.

He just did it to assuage his guilt, which he could have done after he killed Alexander. Daniel giving himself amnesia was totally pointless.Also, he wanted to write himself a note explaining to himself what he must do when he awakened I doubt the Inner Sanctum had an abundance of paper and pens lying around. Notice how relatively deserted the area he woke up in was he fled somewhere safer whilst the potion knocked him out. Having fed the potion to the people he had tortured many times before, he likely already knew that drinking Amnesia would have that side-effect and so hastened to get himself to a part of the castle that was Shadow-free before he passed out. We know that Alexander meant to trap Daniel so that the Shadow would find him and consume him whilst he escaped to the other world we also know that the Amnesia potion caused Daniel to pass out for a short while before later awakening and having next to no memory of his past. I've got a different explanation: Daniel was running from the Shadow.Perhaps he didn't think it would be wise for his memoryless self to wake up in the center of hell without a clue as to why he got there.So why take the amnesia potion and then travel all the way to the other side of the castle? Why not just stay where the orb was shattered?.
