Hardmode

Hardmode is activated permanently in a players world when the Wall Of Flesh is defeated with the warning message in the chat saying 'the ancient spirits of light and dark have been released'. As soon as the Wof has been defeated a brand new biome called The Hallow will spread and generate over a pre-existing biome deleting the biome and replacing it with The Hallow. Most of the Pre-Hardmode biomes will get new monsters and eight new NPCs will move in (providing the player has the right conditions) there is also five new bosses to fight and summon. As with the entrance of the quick spreading Hallow biome into the world the Corruption spreads a lot quicker in hardmode and can then corrupt stone and sand blocks. The Crimson will also spread faster and get six new monsters when the player gets high in the sky they also have a chance of spawning a new mini boss called a Wyvren and in the console version Arch Wyvrens.