Poisonous Gas

I’ve been making some NPC killing stations with body disposal and other industrial facilities, but I never managed to make the killing of the NPCs quick and efficient.

Gas would be the solution to my problem, it should kill NPCs within a certain radius and should be Wiremod ready. The killing time should be around half a minute.

The gas shouldn’t be visable due to realism and performance reasons.

The gas should be emitted from a prop, preferable a soda can or any other small prop.

Thanks!

It should probably be visible, otherwise it’s going to be difficult to avoid it, and mingebags can cover masses of areas of maps whether it’s visible or not.

I think a gas stool would be interesting if it was made like the Anti-Noclip fields, is resilient to Noclip, and is admin only. Just a thought though.