2008 · Core Rules (min needed to play)

Mechagenesis: The True20 Robotic Roleplay Sourcebook

Earth is under attack by the Legion, an army of shape-changing extraterrestrial robots seeking galactic domination. Players take the roles of exiled robots in the Alliance or human members of the Global Defense Corps, fighting to end the invasion. The True20 roleplaying rules include guidelines for creating robots that transform into vehicles, weapons, devices, animals, or buildings. They also cover futuristic weapon design, vehicle combat, special powers, and combining multiple robots into a larger humanoid machine. Players can run either robots or humans.