I am currently working on a space opera setting, and I wanted to include a gaseous species of sapient aliens that hail from a gas-giant reminiscent of Jupiter.
Before I ask my question, I wanted to give a brief description for them. They are very similar to a character from Hellboy called Johann Kraus, in the sense that they are often confined into a specialized containment suit when they interact with other sapient species. In their true form however, they are little more than a floating cloud of gas.
They are biologically immortal, and do not require food, water, sleep, or oxygen to survive, but they are still capable of being killed. The thing is though, I can’t for the life of me figure out how to kill them.
My question is this: How could you kill a being made out of gas in a believable way?
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