I've been playing terraria recently. I've been trying to initiate hardmode into my first world for a while now, but I can never find voodoo demons when I want to.
Any help about hardmode in terraria? Particularly about the spread of corruption?
Here to things you must do before entering hardmode. First, fish as many crates as possible and open them after entering hardmode. This way you'll get many of the hardcore ores without having to mine many of them yourself. Secondly encase the areas you want to protect from the corruption with 5x5 tunnels reinforced with wood or bricks on the sides. Especially the jungle. If corruption gets to the jungle it will start devouring it and there are many things you'll have to do there for the end game. If the world you made is a large one then this will be more tedious.
Also as far as voodoo demons go. If you stay and loot the obsidian towers for long enough one will appear eventually.