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Size 17x17
Where Compound

A Reactory is a building used to combine finished metals into alloys, using resin as a catalyst. The process also requires charcoal.


This building becomes available after you have learned the Advanced Metallurgy tech.

Also, Advanced Metallurgy or higher must be learned to operate an already constructed Reactory. Higher levels of Advanced Metallurgy allow increasingly more alloy types that can be crafted.


Built in a Compound. Uses 17x17 cells.

Hopper Upgrades

Once a reactory is built, it may be upgraded to allow larger batches. This requires Structure Reinforcement 2 (Level required to learn: 18) to install the upgrade, but not to use it. Upgrades must be installed in order, e.g. you must install the 2x upgrade before you can install the 4x upgrade.

An upgraded reactory allows you to choose the batch size to use when starting a new alloy. The initial charcoal, resin, metal costs, and final alloy yield are multiplied by the batch size (note: due to rounding, the yield may not be exactly scaled - see individual alloy pages for details).

The cost to reheat a large batch does not increase. It always costs 3 charcoal and 1 resin to reheat, regardless of batch size. This means that reheats are effectively cheaper for larger batches.

2x Hopper Upgrade Cost

4x Hopper Upgrade Cost

7x Hopper Upgrade Cost


To produce a normal-sized batch of an alloy requires an alloy-specific combination of metals and Resin, and 5 Charcoal to fuel the Reactory. Larger batch sizes in an upgraded reactory scale the required inputs according to the batch size.

An alloy must be "crystallized" by working the reactory, observing a number of rings and clicking in specific places. The yield of the reactory depends on how well this is done. See the Alloys page for more details and current theories.

After an alloy has crystallized, you have the option of either accepting the yield and taking the alloy, or reheating the batch. Reheating the batch costs 1 Resin and 3 Charcoal, and allows you to try to crystallize the alloy again for a better yield. You can repeatedly reheat a batch as many times as you like before finally taking the alloy. Note that Octec's Alloy cannot be reheated!

Alloy Needed metals
(for 1x batch)
Resin type
Advanced Metallurgy 1
Brass 7 Copper, 1 Tin Resin:Stout Palm
Bronze 7 Copper, 1 Zinc Resin:Fern Palm
Pewter 7 Iron, 4 Antimony, 1 Brass Resin:Royal Palm
Steel 7 Iron, 1 Tin Resin:Towering Palm
Advanced Metallurgy 2
Moon Steel 7 Steel, 3 Brass, 3 Pewter Resin:Hawthorn
Sun Steel 7 Steel, 3 Brass, 3 Bronze Resin:Umbrella Palm
Advanced Metallurgy 3
Thoth's Metal 7 Steel, 4 Moon Steel, 4 Sun Steel Resin:Folded Birch
Water Metal 7 Steel, 4 Moon Steel, 3 Silver Resin:Pratyeka Tree
Advanced Metallurgy 4
Metal Blue 7 Steel, 5 Thoth's Metal, 5 Water Metal, 4 Tungsten Resin:Cerulean Blue
Advanced Metallurgy 5
Octec's Alloy 7 Steel, 5 Thoth's Metal, 5 Water Metal, 4 Tungsten Resin:Oil Palm