If you’ve spent hours grinding late-game Terraria resources just to wait for slow crafting stations to churn out building blocks or gear, you know how frustrating it can be to waste time on tedious tasks. That’s exactly why the auto hammer is one of the most underrated quality-of-life items you can add to your loadout. This guide will walk you through exactly how to get an auto hammer in Terraria, what it does, and how to make the most of it once you have it. I’ve used this item across three separate playthroughs on both classic and master mode, so I’ll also share the little tricks most generic guides skip.
Prerequisites You Need to Unlock the Auto Hammer
Before you can get your hands on this handy tool, you’ll need to hit a few key milestones in your playthrough first. You don’t have to beat the entire game to unlock it, but it is a Hardmode-exclusive item, so you’ll need to have defeated the Wall of Flesh first to switch your world over to Hardmode rules.
The first specific requirement is to defeat at least one mechanical boss. This can be The Destroyer, Skeletron Prime, or The Twins, it doesn’t matter which one you pick. Beating any of these three bosses will unlock the Steampunker NPC, who is the only vendor that sells the auto hammer. You’ll also need to have an empty valid house available for her to move into once she’s unlocked.
Next, you’ll need access to a Glowing Mushroom biome, either naturally occurring underground or a custom one you build on the surface. The Steampunker will only list the auto hammer in her shop when she is physically located inside a Glowing Mushroom biome, so even if you already have her living in your main base, you’ll need to move her temporarily or permanently to a Mushroom biome to buy the item. You’ll also need 1 platinum coin to make the purchase, so make sure you’ve saved up enough from selling extra loot or ore before you go shopping.
Exact Steps to Get an Auto Hammer in Terraria
Once you’ve checked off all the prerequisites, the actual unlock process only takes 10 to 15 minutes if you have the right materials on hand. First, if you don’t already have a Glowing Mushroom biome set up, you’ll want to build one. You can collect Mushroom Grass Seeds from breaking Glowing Mushroom plants in natural underground Mushroom biomes, or buy them from the Dryad if you have her housed in a Mushroom biome already.
Lay down at least 100 blocks of Mud, then plant the Mushroom Grass Seeds on top of them. Wait a few in-game days for the grass to spread and for Glowing Mushroom plants to grow, and the game will eventually register the area as a valid Glowing Mushroom biome. Build a small 3x6 valid house with walls, a light source, a door, a table, and a chair inside this biome, then use the house assignment menu to move the Steampunker to this new house.
Make sure your in-game clock is not during a blood moon or solar eclipse before you check her shop, as NPCs sell event-exclusive items during these times and the auto hammer will not show up. Once the Steampunker has fully moved into the Mushroom biome house, open her shop and you’ll see the auto hammer listed for 1 platinum coin. If you don’t want to keep her in the Mushroom biome permanently, you can move her back to your main base right after you buy the hammer, no need to keep her there long term.
Key Perks and Uses for Your Auto Hammer
A lot of new players write off the auto hammer as a niche crafting station, but it has a ton of uses that make the 1 platinum price tag well worth it, even if you don’t play a ranger class. I keep one in my main base crafting area and a second in my explorer hotbar for on-the-go builds, and it’s saved me dozens of hours of tedious crafting time across all my playthroughs. Its core benefits include:
- Only crafting station that can turn Chlorophyte Bars and Glowing Mushrooms into Shroomite Bars, the core material for the best pre-Moon Lord ranger armor and stealth accessories in the game
- Cuts crafting time for all workbench-compatible items by 50%, so you can churn out hundreds of building blocks, potions, or ammo stacks in half the time you’d spend at a regular work bench
- Functions as a portable work bench if you carry it in your hotbar, so you can craft on the go without placing and breaking a regular work bench every time you stop to build an outpost or repair gear
- Does not require fuel or power to run, unlike similar crafting stations you might have used in modded Terraria playthroughs
Even if you main a melee or mage class, the crafting speed boost alone makes this item worth picking up. I’ve used it to craft 500+ stone slabs for cross-biome bridges in less than a minute, which would have taken twice as long at my old regular work bench. It’s also great for bulk crafting healing potions or mana potions before big boss fights, so you don’t have to sit around waiting for each potion to craft one by one.
Common Mistakes to Avoid When Unlocking the Auto Hammer
I’ve messed up the auto hammer unlock process more than once, so I can share the most common mistakes players make that waste time and resources. The first one is not counting enough Mushroom Grass blocks for your custom biome. The game requires at least 100 blocks of Mushroom Grass to register an area as a Glowing Mushroom biome, so don’t stop at 50 or 60 blocks and wonder why the Steampunker isn’t listing the auto hammer in her shop. I made this mistake on my first master mode playthrough, and I spent 20 minutes refreshing her shop before I realized I was 28 blocks short of the requirement.
Another common mistake is buying the auto hammer when you don’t have a free inventory slot. It’s easy to forget to clear a spot when you’re rushing to grab the item, and if you’re in an underground Mushroom biome, it can fall into a pit of Glowing Mushrooms and get eaten by a roaming Giant Fungi Bulb before you can pick it up. Always double check your inventory before you click buy, especially if you’re carrying a full load of mining loot.
You also don’t need to buy more than one auto hammer unless you want to place one in multiple outposts. It never breaks or wears out, so one is enough for most playthroughs. Don’t waste extra platinum on duplicates early in Hardmode when you could be spending that money on better armor or weapons to beat Plantera or the Golem. If you’re short on cash, you can wait to buy the auto hammer until you’ve got extra funds to spare, it’s not a mandatory unlock until you’re ready to craft Shroomite gear.
At the end of the day, the auto hammer is one of those small quality-of-life items that makes late-game Terraria way less tedious, even if it doesn’t seem like a big unlock at first glance. Once you know how to get an auto hammer in Terraria, you’ll wonder how you ever played through Hardmode without it, especially if you love building or main a ranger class. Don’t skip the small steps of setting up that Glowing Mushroom biome, and you’ll have this handy tool in your inventory before you know it. Next time you’re grinding for Chlorophyte to make late-game gear, you’ll be glad you took the 10 minutes to unlock it.