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In the RPG, there is a new characteristic — "mechanics." It will be applied differently across various games. In some, it can be used to craft catapults or ballistae from available materials (if they are suitable for this purpose); in others, this skill could be used to build a robot or even a starship. The variation will be approximately as follows:
1-5 - simplest mechanisms (teapots, irons, mini-droids, computers)
6-20 - medium mechanisms (wrist crossbows, multifunctional blades, traps, light and medium power firearms, lightsabers)
21-50 - complex mechanisms (Ballistae, catapults, mechanical armor, exoskeletons, heavy firearms, weapons of mass destruction, droids, starships)
50 - maximum skill level.
Well... This is, IMHO, unnecessary.