I disagree. I also disagree that our souls require nourishment. High order, malignant narcissists do not act as they do because their souls are dark--they act that way because their conscious minds are wired in such a way that their souls cannot influence their behavior. Their souls fucked up so badly in previous lives and they want to be redeemed, which is Light, not Dark, so their souls' penance is to live out entire life cycles witnessing the darkness of their humans devoid of empathy. The souls have empathy, so watching this tortures them. This was the message of https://medium.com/know-thyself-heal-thyself/what-is-the-source-of-the-myths-that-vampires-have-no-reflection-and-are-destroyed-by-sunlight-7bf7b8eedf93, with which you engaged but I guess I did not articulate as well as I thought.

As for souls needing nourishment, please see https://soulutions17043.medium.com/this-reminds-me-of-a-conversation-i-had-on-twitter-with-a-man-i-met-on-that-platform-when-he-posted-66801f2887 and especially please see Anthi's poem linked to therein.