I always put a random chimney in any house with a furnace. It dawned upon me that a cool thing would be carbon dioxide. It is produced by furnaces, in small amounts by fire, and by lava. It isn't produced in hell, because hell is supernatural (and it would make hell impossible after a short while). Basically, it is air. It goes up as much as it can. If it reaches the top of the map, it dissapears. If it is unable to find an exit, it will slowly build up. It starts 'drowning' you if you are inside of it, and is best put out via chimney. It also causes monsters to be detered, if they enter it. It goes up relatively fast. If it builds up to the point where it would add another block of carbon dioxide, but can't due to lack of space, it locates the thinnest wall, and explodes out, in an effort to reach the surface. Preference is higher levels. This can cause mining explosions, adding another dynamic to the game. Another thing carbon dioxide does is it makes trees grow taller/wider if exposed to enough.
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Warriors of Chaos!!!
Khorne, Slaanesh, Tzeentch, Nurgle - So many ways to die, so few times to do so.