I mentioned on slack a while ago regarding the immunity of a species to its own toxins. There are very few (if any) examples of creatures in nature who are not immune to their own venoms. Not being immune would essentially be an evolutionary dead-end. With that in mind I am very much in favor of the lock and key method. This means species with sufficiently similar toxins would be essentially immune to one another’s attacks. However, the question is how do we illustrate the “closeness” of various toxins? I don’t think that different colored clouds is a good option because those are already used for compounds. Perhaps a good solution for representing toxins that allows the player some means of deciding if their own toxin is sufficiently similar for it to not pose an imminent threat is to simply render all toxins as the same color but to illustrate the difference between your own toxin and the other toxin via their intensity. If you have no toxins then they all appear a very menacing deeply saturated red (or purple or whatever). If you develop a toxin then you see your own cloud as a much less saturated version of the same color indicating that it will not harm you.
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