Check out my horse!

As Lightning ad Hope make it out of the scrap yard wasteland they come across a giant bipedal vehicle like they fought before. Now they can pilot it and it starts an odd mini game where you have to stomp and smash as many soldiers as possible.

After that there is a cut scene of Lightning and Hope having an argument about Hope not being able to keep up. During the argument Lightning's brand starts glowing and her summon battle for Odin starts.

This battle was ridiculously frustrating at the start, Odin would kill both Hope and Lightning within seconds of the fight starting. Fortunately when you die in a fight the game restores you to just before the fight, not the last checkpoint. After many, many, tries I figured out a strategy of having both of them healing right off the bat, then both using magic when Odin starts blocking, then repeating that when he starts attacking again. First time I used this strategy though I forgot that I had to hit X to end the fight when Odin's meter was full and he eventually wore lighting down.

In the end I finally beat Odin and he then transformed into a horse for Lightning. The summon system for this game in sort of like in FFX, where the caster remains on the field and fights together with the summon. There is also a meter that fills up that lets the summon transform into ride mode and new massive attacks are unlocked.