-In the amidst of war on cybertron.. in the battle between Autobots and Decepticons, other factions and rouges.. Explosions are heard miles away and rumble the ground [Insert your character/OC or your group/teamates or faction (if you have one)] You see many different groups of bots battling and falling-

(This can be any version/erra of transformers you would like, and change the plot if needed, to your taste)