Hazardous

Hazardous is a mod that allows a modpack maker to add hazards (poison, radiation, ...) to your world based on various conditions. It adds various items to help and combat those hazards and is extremely configurable. Check out this link for more documentation: 

Hazardous Documentation

Thanks to TqLxQuanZ who asked for this mod for his DeceasedCraft modpack! He also contributed all of the assets (sounds and artwork)