The Inferno Forge is a multiblock structure added by Embers. It is one of the largest multiblock structures forming a 3x3x2 machine around the placed Inferno Forge block. The Inferno Forge is used to upgrade tools that have collected enough Heat. It uses 3,200 embers each run and has an internal ember storage of 32,000.
The Inferno Forge requires a Mechanical Core underneath the center block of the forge to work properly. Connect an Ember Receptor or an Ember Funnel to the Mechanical Core to fill it up with Ember. Open up the Inferno Forge by right-clicking the hatch on the top of the forge. Drop the tool or armour piece that is ready to be upgraded, throw in some Ember Shards (7–10 is usually enough), then close the hatch by right-clicking the hatch again. If done correctly, the Inferno Forge will start releasing a lot of smoke and open itself after 10 seconds. A chime is produced if the upgrade was successful.