The first thing to do in Hardmode is to go to the natural Corruption/Crimson Biome and start smashing Altars. When smashing one altar, the world will be blessed with Cobalt or Palladium Ore; Smashing another one will make Mythril or Orichalcum Ore appear; Smashing a third one will make Adamantite or Titanium Ore appear.

The 6 different Hardmode ores you can get from smashing demon/crimson altars are: Palladium Orichalcum Adamantite Cobalt Mythril Titanium Same as before, you have a 50/50 chance to get these ores.

You’ll need a Pwnhammer or a stronger Hardmode hammer to destroy Altars. This, in turn, will spawn ores. When you destroy the first three altars, it will spawn these ores at random: Cobalt or Palladium ores Mythril or Orichalcum ores Adamantite or Titanium ores Once you’ve spawned one type of ore, you can’t spawn its counterpart in the same world.