I think that fanatic purifiers at least should have an option to develope and use these kind of weapon. They already want to exterminate everyone else and cant conduct any diplomacy so no chance there of agreeing on some kind of rules to warfare.
In my opinion they would be developed for each species separatly - not as tech but in the situation log. Result could vary greatly. Failure or succes and succes would vary as well - how deadly the results are - like it kills 5 of 10 pops. It would last a given time.
After using it it would start in a planet and kill of said percentage. After that attacked could try varied countermesures - quarantine and developing antidote etc.
In my opinion they would be developed for each species separatly - not as tech but in the situation log. Result could vary greatly. Failure or succes and succes would vary as well - how deadly the results are - like it kills 5 of 10 pops. It would last a given time.
After using it it would start in a planet and kill of said percentage. After that attacked could try varied countermesures - quarantine and developing antidote etc.
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