There is no boss fight in this chapter, just a lot of mechs. At the end of the level is a courtyard. After dispatching some gun scouts a new shiny melee mech will attack you. It is basically tougher than the regular melee mech. You may pursue the usual strategies in dispatching it. Several will attack you over the course of the battle, but if you use the vulnerabilities of other mechs strategically the new mechs shouldn't pose a problem.