I would like a mod that makes rain damage the player. I am thinking like a heart or two per second. Or maybe just give the player a few seconds of the wither potion effect. You might be able to detect if the player is getting rained on by detecting if the players block gets direct sunlight. I am not a modder so I don't have a clue. I want it to make minecraft as HARD as possible. I tend to get bored otherwise.