Eisen slotted the cog into its position, smiling as he finished the prototype of the magic motor that him and Xenia developed together. He let his mana flow into the crystal placed at the top of the box of mechanisms, letting it be saved there and carefully flow into the airtight chambers contained within. And the moment he did, the motor started up, as dozens of small pistons started being pushed up and down by the expanding and contracting air inside of the chamber, supported by the circular motion of the pieces attached to the bottom of the pistons.
Together, each piston worked together to rotate the cogs placed underneath, which was quickly translated into a round metal bar that was sticking out from the motor as a test. It was spinning at incredible speeds, and managed to do so almost silently. The old man looked at the object proudly, quickly turning over to Xenia, who was staring at it with the same expression that he had been.
