Roman Devotio Ritual: There is an option to have the Roman general perform a "devotio" ritual if they are on the edge of losing the battle. Upon clicking, the Roman body guard unit goes berserk and if the general manages to get himself killed AKA "devoted", every Roman unit will get a morale and attack boost for the rest of the battle.
This mechanic will TOTALLY not be exploited by the player at all, of course.