Feature Request

Air Quality for example in Caves, specific Biomes.

What feature are you suggesting?

If you stay too long in caves or specific Biomes (configurable) you start to take damage.

Why should it be added?

By using specific mods, the Overworld can get quite dangerous. An easy way out is to just dig into the ground and live in a cave, instead of building a base on the Overworld.
With this addon, living in a cave gets more challenging and you cant just take some wood logs and food with you in the eraly game and come out with full iron gear or even diamond.

i think there should be a way to counter this, such as a gas mask or something similar to negate this effect, though having a durability meter might also be nice for the mask

We planned for this at one point, but air quality/gasses are a big enough feature that it'd be better suited for a separate mod (Which, separate mods do already exist for this)