If you’ve spent any time grinding through late hardmode Terraria content, you know how tedious it can be to craft large batches of furniture, gem blocks, or reforged gear by hand. That’s where the auto hammer comes in, one of the most underrated quality of life items you can add to your loadout. I spent three hours running back and forth between my base and the underground cavern my first time hunting for it, because I missed a key prerequisite most new guides skip. This post breaks down every step you need to follow, no guesswork required.
Pre-Hardmode and Early Hardmode Prep to Access the Auto Hammer
You can’t farm for the auto hammer as soon as you spawn into a new world, it only becomes available once you hit specific hardmode milestones. Skipping any of these steps means you’ll never see the NPC that sells it, no matter how many caverns you explore.
First, you need to defeat the Wall of Flesh to unlock hardmode. That’s the base requirement for all late game content, so if you haven’t beaten that boss yet, prioritize that first. Next, you need to defeat at least one of the three mechanical bosses: The Destroyer, Skeletron Prime, or The Twins. You don’t need to beat all three, just one to trigger the spawn of the next required NPC.
You also need to have a valid empty house available in the underground cavern layer. That means the house is below the surface layer (you can check your depth on the right side of your screen to confirm), has walls, a light source, a door, a table, and a chair. The house can’t be on the surface or in the underworld, it has to be in the cavern layer specifically for the NPC to move in.
One more thing: You need to have at least one defeated mechanical boss and a free cavern house before the Truffle NPC will even consider spawning. If you don’t know who the Truffle is, that’s the NPC that sells the auto hammer, so getting him to move in is non-negotiable.
How to Get the Auto Hammer in Terraria: Exact Spawn and Farm Steps
Once you’ve checked all the prerequisites off your list, the actual process of getting the auto hammer is pretty straightforward, as long as you follow the steps in order. I messed up the order my first run, so I’m saving you that frustration here.
First, confirm your Truffle NPC has moved into your underground cavern house. You’ll know it worked when you get the pop-up message that says “The Truffle has arrived!” If you don’t get that message, double check your house is in the cavern layer, has all required furniture, and you’ve beaten at least one mechanical boss. If you still don’t see him, try clearing out any nearby corruption or crimson biomes within 50 blocks of the house, he won’t move in if the area is infected.
Once the Truffle is settled, you just need to gather enough coins to buy the auto hammer from him. The auto hammer costs 40 platinum coins, which is a pretty steep price if you haven’t been farming for gold in late hardmode. If you’re short on coins, you can sell excess boss drops, farm gem trees, or sell high value crafting materials like chlorophyte bars to make up the difference quickly.
There’s one catch: the Truffle only sells the auto hammer during hardmode, even if you somehow get him to spawn pre-hardmode (which is almost impossible without mods). So you don’t have to worry about missing it if you already have the Truffle in your pre-hardmode world, he’ll add it to his shop as soon as you unlock hardmode and beat a mechanical boss.
I recommend checking his shop first thing after he moves in, sometimes players forget to scroll past the first few items and miss the auto hammer entirely. It’s listed under the crafting tools section of his inventory, right next to the glowing mushroom furniture he sells.
Top Uses for the Auto Hammer That Make It Worth the Grind
40 platinum is a lot of coins to drop on a single tool, so you might be wondering if it’s actually worth the investment. From my 8+ years of playing Terraria, I can say it’s one of the best late game purchases you can make, especially if you like building or crafting large batches of items.
Here are the most useful things you can do with it:
- Craft shroomite bars automatically: Normally you need to stand next to an autohammer to turn glowing mushrooms and chlorophyte into shroomite bars, the endgame ranged armor material. It cuts the crafting time for a full set of shroomite armor by 70% compared to manual crafting.
- Mass produce gem blocks and furniture: If you’re building a fancy base or a gem tree farm, the auto hammer lets you craft 20+ gem blocks at once without clicking repeatedly. I used mine to make a full castle out of diamond blocks last playthrough, and it saved me at least 2 hours of mindless clicking.
- Reforge low tier items in bulk: You can use the auto hammer to reforge common accessories and weapons faster than the standard tinkerer’s workshop, if you’re grinding for perfect modifier rolls for your build.
Another hidden use most players don’t know about is that the auto hammer counts as a valid crafting station for all hardmode furniture recipes, so you don’t have to carry around multiple work stations if you’re exploring and want to craft storage chests or beds on the go. It doesn’t take up any extra inventory space once you place it in your base, so you can leave it set up next to your chests of materials for easy access.
If you’re a player who focuses on combat more than building, it’s still worth picking up for the shroomite bar crafting alone. Shroomite armor is the best ranged armor in the base game, so you’ll need a ton of shroomite bars if you’re planning to beat the Moon Lord with a ranged build.
Common Mistakes to Avoid When Farming for the Auto Hammer
Even if you follow all the steps I listed, it’s easy to make small mistakes that delay you from getting the auto hammer for hours. I made almost all of these my first time, so I’m pointing them out so you don’t have to waste the same time I did.
The biggest mistake I see new players make is building the Truffle’s house on the surface. The Truffle will only move into a house in the cavern layer, no matter how much glowing mushroom grass you plant on the surface. You can confirm you’re in the cavern layer by checking your depth meter: it will say “Caverns” instead of “Underground” or “Surface” if you’re in the right spot.
Another common mistake is not having enough coins when the Truffle moves in, so they have to leave to farm gold and come back later. I recommend saving up at least 45 platinum before you even start trying to get the Truffle to spawn, so you can buy the auto hammer as soon as he arrives, plus any extra glowing mushroom furniture you might want.
Don’t forget to clear out corruption or crimson near the Truffle’s house either. If the infection spreads within 50 blocks of his home, he’ll move out, and you’ll have to build a new house somewhere else to get him back. I always place sunflowers around the edges of his house area to prevent infection from spreading, it’s a cheap and easy fix.
Never buy the auto hammer in a pre-hardmode world if you’re using mods that let you spawn the Truffle early, it won’t work for shroomite crafting until you unlock hardmode, so you’re just wasting your coins if you buy it too early. Stick to picking it up after you’ve beaten at least one mechanical boss, and you’ll be good to go.
The auto hammer is one of those underrated tools that makes late game Terraria so much more enjoyable, whether you’re a builder, a fighter, or just someone who hates mindless clicking. Now that you know how to get the auto hammer in Terraria, you can skip the hours of wasted running around I did and add it to your crafting station lineup as soon as you hit late hardmode. If you have any extra tips for farming coins fast to buy it, drop them in the comments below!