The energy core was still the Bonfire Reaction Furnace, placed around five centimeters below the neck. His Machinery Affinity and machinery skill both improved after the class advancement, so he enhanced the Bonfire Reaction Furnace.
He made a few hidden recesses at the back of the mechanical suit that were connected to the energy core. Energy blocks could be embedded into these recesses. If the energy of the Bonfire Reaction Furnace was finished, these would be the backup energy source. There was also another function—extra power output. It could largely increase the performance of the mechanical suit, comparable to [Overload].
