Minecraft has a lot of blocks, but what if they had more? Why do we need them? Please don't just add lists of things - these will be marked as spam and removed! Also, no furniture, guns, or vertical/"sideways"/"upright"/"standing" slabs (yes, we see you).

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Add a "Bad Air" block and flowing bad air blocks.

Bad Air blocks (or "Noxious Fumes", or whatever you want to call it) could generate from inside the wall of a cave, similar to how Water and Lava sometimes do. The bad air would flow down into the cave and be sickly colored like very faint green or brown flowing liquid or a pool of liquid (greater visual transparency and may not be visible in the dark).

Bad air might also appear in swamp biomes for flavor, although it would not really be a threat to surface travel unless had a chance to form a pool of bad air.

Crossing into bad air would force you to hold your breath. But if you run out of oxygen, you become poisoned in addition to taking damage. Trying to navigate through bad air might also darken your vision (e.g. ink blast), make your vision get blurry, or whatever.

If you can track the bad air to its source you could plug it up, or at least hem it in with dirt blocks so as not to contaminate the lower levels.

You cannot swim out of it or up the flow, so if you find yourself in a hole filled with the stuff you will have to be careful getting out without taking any further damage, if the stuff drops you to 1/2 heart.

Pits and pockets of bad air or fumes would be one more good reason to carry a ladder or some disposable dirt or gravel or sand with you everywhere.

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    I cannot think of a good way for a player to somehow mine and capture a bad air block unless you wanted to handwave it as scoopable with glass bottles somehow?

    Or add to the steampunk gadgetry of Minecraft by introducing a Siphon tool (iron, leather, and string) which can act as a more portable version of the hopper. It would be placeable like a hopper or piston, but usable like a bottle. (It would be intermediate in function between these two items.) When created, a Siphon might start out filled with an Air block. When used on a valid client block, it swaps the block it has with the block it is being used on. Several Siphons chained together could be used as a sump pump maybe?

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    Registered User commented
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    There could be two versions of Bad Air:

    Noxious Fumes - they just poison you.

    Gaseous Fumes - they poison you AND they burn if exposed to fire or sparks; flowing gas burns off while the source block burns perpetually like netherrack.

    Both types of Fumes or Bad Air should be very similar in appearance, or maybe the flammable version is just a shade or two darker or more brown, but both should be much harder to see in the dark than water is.

    In swamps, flammable air could be used tactically.

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    If this is added parrot should get damaged when near it, kind of like how miners used small birds to detect such gas before actual equipment was invented.