R1ch4rd N1x0n
Terrarian
I think it would be cool if there was a hardcore evil biome that is hard to deal with, purification is too weak to remove it, you have to dig it away or use a clentaminator, the monsters do a ton of damage, and the ore from the biome is hard to get, but is quite powerful if you get your hands on enough of it, it spreads VERY fast, just going into the biome itself is dangerous, not the monsters in it, the biome has a gas released from the evil grass and stone that poisons your character with a new debuff, this effect slowly drains your health, it will not go away until you leave the biome, you need a special gas mask to wear into the biome to avoid being killed by the evil gasses, the gas is even worse underground because there is no ventilation. I know some/alot of you will disagree with this, but I like a challenge, this could be optional to have in your world.