The Warden A.P.C. is ERA's armored transport vehicle, armed with a mortar and capable of carrying infantry.
ERA assigns the Warden to soldiers who scored the lowest on their tank exams, just enough to pass. They act as support: lobbing mortar shells at anything in range and offering a ride to anyone who needs one. Not the best at artillery. Not the best at transport. ERA's military knows it. The Warden doesn't care.

