Like I said to Gwiggs, I am definitely open to the idea of characters starting up some kind of drug trade and playing around with it as an ongoing player plot. If they could figure out what specifically it is about the fireflies' native habitat that makes them able to breed there (I don't have anything specific in mind, so you could plot out what it is), I don't see why they couldn't breed them in captivity. That caveat was mostly added to give an IC reason for the swarm to subside in a month or so rather than sticking around forever.
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Like I said to Gwiggs, I am definitely open to the idea of characters starting up some kind of drug trade and playing around with it as an ongoing player plot. If they could figure out what specifically it is about the fireflies' native habitat that makes them able to breed there (I don't have anything specific in mind, so you could plot out what it is), I don't see why they couldn't breed them in captivity. That caveat was mostly added to give an IC reason for the swarm to subside in a month or so rather than sticking around forever.
Let me know if you need anything else!