i thought death curses were a human thing?
How human is human, again?
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We know the Denarians can throw one, and they're definitely not attached to or using the most human of abilities. Even wizards are considered to be slightly different from vanilla mortals, thanks to that nifty little gene that lets them use greater magical talents.
I don't think it's entirely species related, as it pretty much just requires a character to be able to tap into their life force and burn it out.
and this hasn't really been brought up that i've seen but, DR says burst from skull yes? well i think harry just assumed it would physically burst from his skull, due to preconceived notions about the word 'burst' in corrallation to his experiences eg, facehugger from aliens. the thing is DR isn't an elequent speaker. indeed he barely spoke more then a few sentences before CD. i think this is a miscommunication. it WILL metaphysically burst from his skull, not physically. as a spiritual being. if my other theories are correct 'lash' will then be housed in bobs new vessel, becoming harry's new info source.
I'm more worried about the price that's going to get asked of Harry in order to remove the parasite.
Whether DemonReach meant a physical bursting, a metaphysical bursting, or a mental burst (might leave Harry in a coma again) isn't known at this point, any more than we know how long it meant by "Soon" in response to when it would grow so large it couldn't remain contained in Harry any more. I think a lot of people are hoping DR wasn't being literal, just on account of them not wanting anything bad to happen to Harry (heh, heh, heh... they're reading entirely the wrong series).
A metaphysical bursting, though, would have some equally bad ramifications if it happened. Harry might lose his access to soulfire, if it damages him at the metaphysical level DR seems to think it will. Or the parasite might drain him to the point where he no longer has a soul, taking all of it with itself when it finally emerges.
Back to the theory, though: There's been a lot of speculation that any Ramps who were in the NN at the time the bloodline curse was triggered were not affected by it. (Mostly because, in a creepy way, I think a lot of the forum members here liked the Eebs.) If Arianna's "spirit" got sucked into Dresden right before her physical self died, I'm thinking some of what remained of her would be manifesting either through Harry's thoughts or actions. He *does* think about going for Maeve's throat in Cold Days. But before that, and especially during Ghost Story, Harry doesn't seem to be thinking along the lines of a Red Court vamp.