Antivenin in Arsenal has an availability equal to the availability of the venom it counteracts, and a cost equal to half of the venom's cost.
It also says it doesn't cover any venoms from Paracritters... So since the only venoms I can find seem to be from Paracritters
Specifically
Nova Scorpion Venom, Elkeylebnle Venom, and Naga Venom.
Where is the list of non-para critter venom that I can buy it for?