Just started playing Terraria, asked what this key is, my veteran friends reactions are priceless (according to them, less than 0.05% drop chance) : r/Terraria
Guide:Farming Biome Keys or Key Molds - Terraria Wiki
Steam Community :: Guide :: The Key to Biome Farming: AFK farming every biome... simultaneously!?!
Guide:Farming Biome Keys or Key Molds - Official Terraria Wiki
Loot gained trying to get a Crimson Key all evening, to no avail. : r/ Terraria