J Tyran said:
The outsider indirectly provided Corvos weapons though too, he gave Piero visions of different inventions which included Corvos mask and his weapons. Otherwise I agree the Outsider isnt exactly evil, its human failing that lead his "gifts" into causing so much chaos.
If you get the best low chaos ending the Outsider even seems slightly more approving, same for if Corvo spares Daud. Those choices and paths are not so obvious and more interesting to him, makes me wonder if the great leviathan thing is true and he is watching and playing with humans for his own entertainment or study.
That last part is what had me spend hours writing my post instead of minutes.
Why is The Outside more approving of you sparing people? Why is he more inclined to praise positive behaviour than negative behaviour?
Then I read this:
"And Daud -- you just killed the greatest assassin of the age. Did you do it for love of the Empress or Emily? Or was it the primal desire to rise above other men? Do you even know why?"
It always comes back to conviction.
We know little about Corvo himself, but we do know things that might paint a clearer picture of him.
Empress Jessamine Kaldwin is a caring leader who's biggest priority is her people. Since she took Corvo as not only her personal bodyguard, but also her lover, it's not farfetched to conclude that he's just as interested in saving people, rather than murdering them. His title is "Lord Protector" after all and I doubt that's a coincidence.
So if Corvo is implied to be an honorable man with a strong interest in protecting people, that's not exactly surprising when he spares Daud or any of the other people he's sent to kill. Except, Corvo is brutally mistreated, suspected of killing the woman he loved and kidnapping his own daughter. The whole world is against him and yet he chooses to stand by his conviction and
that's what surprises(and delights) the Outsider.
If Corvo kills Daud, then he's succumbed to petty(albeit understandable) emotions and compromised his very being.
"Do you even know why?"
The question is, does the Outsider know why, meaning he doesn't quite understand the motivation behind killing Daud when it's not part of who Corvo is. While there could be any number of reasons(for one, getting rid of an assassin), succumbing to killing Daud is just a result of petty feelings, which is a dissapointing and forseeable outcome.
I'm absolutely certain that the only thing the Outsider is interested in, is surprise.
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Regarding Piero...
I think this is in part an oversight of design, that The Outsider supplies designs to Piero to make things or an excuse to give Corvo things that others in the game don't have access to.
I do believe that Piero is more interested in changing the world(rather than benefit himself like Sokolov), which warrants the attention of The Outsider, but the inspiration has no motive other than supplying Corvo with tools, which is somwhat at odds with what else we know about this. Arguably, it could just be to give Corvo more choices in his own fight.
As others have mentioned, the overwhelming deadly arsenal you recieve as well as the satisfaction of killing people is likely an oversight and a fault of the game, rather than an indication of The Outsider wanting you to kill people.
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Regarding the Leviathans. This is one aspect of the setting I don't understand or frankly haven't bothered to look into. I'm not sure what part they play, if any at all. I can see the obvious signs and the dependancy that their society have on these creatures as well as the implied magic connection between their bones and The Outsider, and Granny Rags calling out to the "Great Leviathan".
Sure, he could be their avatar or aspect and have an interest in why humanity is as it is. Positive actions might indicate that he wants to see the good in humans and have ulterior motives in finding out, possibly to spare them or decide to kill them all off through chaos.
(I haven't played the DLC so I'm certainly missing information.)
Please tell me, what do you think?