[@BCTheEntity] I'm not knowledgeable enough to really talk about if its feasible or not, but I have to say that since the character I proposed to my PM to the GM is maybe, possibly, probably a dark Eldar exile, to have something linked to Slaanesh hanging around you would be hilarious.

If I had to give my uneducated opinion I'd say this tiny rift would be manageable as long as it stays 'hidden' from the attention of demons with real potential, but become critically problematic if something with more power would catch wind of it. EG: A full possession as we are unlucky enough to meet with chaos cultists/sorcerers/marines.

This could make for some relationship between our characters actually, as mine could try and teach yours the good ol' eldar ways of shoving (mostly) negative energy in that hole to make sure your soul isn't sucked out entirely.