You can't destroy a demon altar with a normal hammer. You have to pwn them.
— A loading screen tip
The Pwnhammer is a Hardmode hammer that is able to destroy Demon Altars and Crimson Altars, blessing the world with one of the six Hardmode ores. It is always dropped by the Wall of Flesh. It has a sparkle effect when used, giving off a good deal of light even in total darkness.
While the tooltip states that it can break them, Altars can only be destroyed in Hardmode worlds, i.e. worlds where the Wall of Flesh has been defeated. Each Altar spawns new amounts of Hardmode ores. The first destroyed Altar blesses the world with Cobalt or Palladium Ore, the second Mythril or Orichalcum Ore, and the third Adamantite or Titanium Ore. The ores generated are randomly determined upon smashing the first three Altars, similarly to naturally-spawning ores. Subsequently destroyed Altars will generate the same ores (in the same order).
Its best modifier is Legendary. While Light may seem to provide a better speed boost by percentages, rounding reveals that Legendary and Light mine at equal speeds for this tool.
• “Smash a demon or crimson altar with a powerful, holy hammer.”
- The name is a reference to a series of Metroid-based levels in a level pack named The Invasion 2 for Super Mario Bros. X, a game Redigit has previously worked on.
- The Pwnhammer shares the same color scheme as items crafted from Hallowed Bars, however it itself cannot be crafted.
- The "Pwn" part of the Pwnhammer's name was a popular gaming term from the unofficial language Leet. It is derived from a misspelling of "own", which denotes success and domination, usually in multiplayer. A succeeding player is "pwning" while a failing player is being "pwned".