Terraria is a 2011 action-adventure sandbox game by Re-Logic, originally released for Windows and later ported to other platforms. It involves exploration, crafting, building, and combat in a procedurally generated 2D world.The Calamity Mod is a major Terraria mod that adds extensive endgame content,new items, new enemies, bosses, difficulty modes, biomes, a new class, and numerous other changes to the vanilla game.but there's a twist.in this RPG,every entity you see will be a female.