well I was reading thw wikipedia last night and got inspired. I really like Photo-toxicity, Im photosensitive myself.
I think a Light based poison that makes you weaker against light is good. I dont know if it should override neuro/regular or be separate. Somehow increasing damage from light effects and light creatures is the one.
Cyanotoxin shouldnt be new, just big, and Apitoxin is bee sting poison. there should be bees in elements. So really just one new kind of poison for sure, and a big poison effect. Apitoxin is possible to either work on creature or be a new kind of poison. Im also looking into Blue-Ringed Octopus and Box Jellyfish as creatures