ToxicRain Mod 1.12.2Published May 21, 2019
ToxicRain Mod 1.12.2 is a small mod that makes rain poison players. It can also be configured to do so for snow, as well as water blocks. It provides a potion that protects from the rain (but not other forms of poison), which can be made by combining a potion of poison with sugar in the brewing stand.
Rain and snow are colored brown-greenish when they are toxic. The color is configurable and the system can be disabled entirely.
Players can be given a delay/grace periods, during which they will not be poisoned by rain. A delay can be applied through the /toxicrain command, the CraftTweaker integration, or a variety of config options. By default, players receive a 30-second grace period upon their first spawn and a 10-second grace period upon respawn.
How to install:
Make sure you have already installed Minecraft Forge.
Locate the minecraft application folder.
On windows open Run from the start menu, type %appdata% and click Run.
On mac open finder, hold down ALT and click Go then Library in the top menu bar. Open the folder Application Support and look for Minecraft.
Place the mod you have just downloaded (.jar file) into the Mods folder.
When you launch Minecraft and click the mods button you should now see the mod is installed.