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The Magma Crucible is a machine which uses MJ power (Minecraft Joules) to melt things into liquid. Typically uses quite a bit of energy. It mainly serves to make lava a renewable resource. It uses 30 MJ/t, so 8 Magmatic Engines are enough to power it with some left over. If netherrack is used it can output enough lava to power the engines and a Thermal Generator.