Alloy Furnace

The Alloy Furnace is a large machine from the Eternal Starlight mod, which is used to smelt ores into more ingots than a normal Furnace gives and to make alloys like Golem Steel and Unrealium. It can’t be crafted, so you’ll need to take one from the Golem Forge or get it from the Starlight Golem, which always drops one when it’s defeated.

Once it’s set up, it works a lot like a furnace with nine input slots, but it heats up the longer it burns fuel and will explode if it’s left to overheat. That’s why it has a slot for a coolant as well, which is where items like Snow, Ice and Glacite come in.

Getting the Alloy Furnace

There’s no crafting recipe for the Alloy Furnace, and every one you find in the world will already be an Oxidized Alloy Furnace. The alloy rooms inside the Golem Forge have them placed around the room, and mining one will give you the whole furnace as an item, which can then be carried home and placed down again.

The other way to get one is from the Starlight Golem, as its loot chest gives every player who took part in the fight their own Oxidized Alloy Furnace. It works exactly the same as a clean one does, and the oxidized look is only cosmetic, so there’s no need to scrape it before using it.

If you’d rather have the clean look, an Iron Axe or any other Axe will scrape it back into a normal Alloy Furnace. A normal one will slowly oxidize again over time, just like Copper does, unless it’s waxed with Honeycomb or Raw Amaramber, which can be used on the placed furnace or crafted together with it.

Waxed Alloy Furnace

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The Alloy Furnace is a big block, as it takes up a space 2 blocks wide, 3 blocks deep and 3 blocks tall, and it won’t place unless all of that space is clear. It’s also a tough block to break, with the same blast resistance as Obsidian, so it won’t be damaged by Creepers near your base.

Using the Alloy Furnace

Opening the Alloy Furnace shows a 3×3 grid for ingredients, a fuel slot, a coolant slot and three output slots. The ingredients are shapeless, so they can go anywhere in the grid, and each recipe takes 20 seconds to finish, which is slower than a Furnace but gives you more for each ore you put in.

Any fuel that works in a normal Furnace will work here as well, like Coal, Charcoal, Blaze Rods or a Lava Bucket. A new piece of fuel is only lit when there’s a valid recipe in the grid, but once it’s burning it will carry on to the end, even after the ingredients have run out.

The furnace also works with Hoppers, which is handy for anything you’re running over and over. Hoppers on top will fill the ingredient grid, the front and back take fuel, the sides feed in coolant, and one underneath will pull the finished items out of all three output slots.

Alloy Recipes

Most of the recipes are for turning ores into ingots, and they all use Saltpeter Powder, while Gold and Copper need a Starcore as well. Ore blocks need to be mined with Silk Touch to be used here, although raw ores work too and give a little more for each one you put in.

The Netherite recipe is worth knowing about, as it only needs 2 Netherite Scrap for an ingot where the Crafting Table needs 4. Golem Steel is the other big one, since 3 Deepsilver Ingots and 2 Golem Steel Nuggets will make a whole ingot, and that ingot can be crafted back into 9 more nuggets to keep it going.

Golem Steel Ingot

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Unrealium Ingot

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The Unrealium Ingot is the hardest alloy to make, as it needs a Golem Steel Ingot, a piece of Malarite and a Soul Dew on top of the Deepsilver. It’s used for the Unrealium Equipment, which is why a lot of players will want an Alloy Furnace running before they go after that gear.

Dimslag

Every ore recipe gives some Dimslag alongside the ingots, anywhere from none up to a handful at a time, and it goes into the second and third output slots. It can be placed as a block, but it’s more useful to break, as mining it can drop a Deepsilver Nugget instead of the block itself.

Without Fortune, that happens 15% of the time, and it rises with each level until Fortune III gives a nugget every time. There’s also a small chance that the nugget will be an Oxidized Golem Steel Nugget instead, which is a slow but steady way to get Golem Steel before you’ve beaten the Starlight Golem.

Overheating and Coolant

The Alloy Furnace heats up for as long as it’s burning fuel, whether or not there’s anything left to smelt, and the heat bar in the middle of the screen shows how close it is to overheating. After about 10 minutes of burning without a break, it will explode, which destroys the furnace and throws everything inside it out into the blast.

It gives you some warning first, as the furnace will start to glow and shake once it’s close to the limit. The heat also drops again whenever the fuel runs out, and it cools off at the same rate it heated up, so a furnace that’s only used now and then won’t ever get close to exploding.

This is what the coolant slot is for, as a coolant will slow down how quickly the furnace heats up while it’s burning, and speed up how quickly it cools down when it isn’t. Each coolant item lasts a set amount of time before the next one is used, and one is taken from the slot as soon as there’s any heat in the furnace.

Blue Ice is the best coolant for a furnace that’s going to be running for a long time, as a single block lasts for well over 20 minutes and cuts the heat down to a fifth. Frozen Tubes are easy to come by in the Golem Forge too, since the Freezes there drop them, so it’s worth keeping a few back for the furnace after the fight.

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