The Nightmare Pickaxe is a tool that can mine most blocks and ores. The Nightmare Pickaxe is also the third-best Pickaxe in Pre-Hardmode before the Deathbringer Pickaxe. It is the Corruption equivalent of the Deathbringer Pickaxe.
The Nightmare Pickaxe is one of the easiest items for a player to obtain that is a melee weapon and gives off particles. The particle effect given off by this tool are extremely similar to the particles that are emitted from Demonite Ore and Shadow Orbs.