Discovery, Exploration
Mex finds himself in Sunnyvale and starts his search for his old friend. He's successful in doing so, and he learns that the primordial mimic had been calling all mimics back home; a call that Roxas could not ignore. He also encounters an archdevil by the name of Zariel here, who was using the mimics to build some kind of monument that unlocks the latent power of those that use it. Zariel gets away and Mex brings Roxas on the long way to Hell- The River Styx.
Mex is traveling aboard the primordial mimic by this point. This is the payment for Mex dealing with Zariel.