break: What would cause your OC to break down completely? What do they look like when that happens? Has anyone ever seen them at their lowest?
Ancora
This is very obviously referring to an emotional break / BSOD type of thing, but to start with: in the universe where daeva are a little more destructible Ancora would be having a bad time. Judy successfully killing Cam and then busting all their art objects in Milliways would be a pretty severe hit to their overall magic/consciousness supply but would not, I think, kill them outright. The overall number of vampires being appropriately gothy on earth is just too high. And in fact in order to go full "mote of misery and unfulfillment" I do think every vampire needs to be dead and every sangrade needs to be out of magic. (It takes way less than that to forcibly teleport them back to the forelti realm with no immediate way to leave it.)
The 'what do they look like' bit is interesting for Ancora specifically - obviously a lot of it depends on how people around them are acting and how much emotive skill they've picked up. Aside from the specifics of dark precipice, I think they're generically likely to remodel themself a new outfit, do a lot of sad music, and, in situations where they aren't of the impression that all weather displays are scary to humans, literally make it rain/thunderstorm/snowstorm/etc.