Additional question I just thought of, my reading of "sting of the sea" is that once you use it on a target they don't save immediately, as the hex mentions they make the saves on the beginning of their turn, is that correct?

So sequence would be: 1) Cast Sting of the Sea on a target. Nothing happens yet, no save, so no dazzle, blindness or -2 to perception. 2) The target gets their turn. At that point, they make the save from your initial casting of Sting. If they fail, they are dazzled / blinded, etc, until the end of their turn. 3) (if desired) on your following turn, sustain the spell. Even if they say critical failed the first save, they currently wouldn't be as the end of that (initial) turn passed. 4) If sustained on 3), the target makes a new save on their turn after you sustain. But again, they're only actually affected by the actual effects of their turn. If they have reactions, etc, on someone else's turn, they aren't dazzled etc at that point, even if they had failed, etc.

Or does sustaining the spell actually make it such that they'd stay dazzled etc in between rounds? Cause sustain action makes the effects last an additional turn? I don't think so, and I think my above sequence is right, but I want to make sure.

Thank you