Caius listened quietly as Eden explained to him what the strange black creatures were. He looked down at his Keyblade when the other boy mentioned that it was a weapon of heart. So this was what his heart was like? Caius didn't understand how that worked, but it was obviously the shape it was for a reason. He didn't notice when Eden killed the Heartless, he was too focused on the rooftops in front of him. He really didn't want to fall into that strange darkness. And the part about darkness in every heart kind of worried him, though it did make sense. Did he have a lot of darkness in his heart? Was that why his Keyblade looked so dark? He'd have to ask Eden about that later. When they weren't trying to save the entire town.

He landed in the town square about the same time as Eden did. He still didn't see a keyhole on the mural. He instantly dropped into a fighting stance as the flying creature, he assumed it was another Heartless, burst through a nearby building. He didn't know how to fight this thing, he didn't know how to wield the weapon that could kill it, and he didn't have any fancy magic spells like Eden did. But that sure as hell didn't mean he was going to sit down and let it destroy his town. He would protect this place even if it meant losing his life. When the other boy yelled Gravity again and magically slammed the flying Heartless into the ground, Caius knew what he had to do. With a fierce battle cry, he ran at the Heartless, being mindful of its flaming tail. When he got close enough he drove his Keyblade into one of the Heartless' legs. 

It roared in anger and pain and looked as if it wanted to kill Caius. Well more than it already did. He attempted to tug the Keyblade out of the Heartless' leg, only to find it not wanting to come loose. Suddenly the creature's tail slammed into his chest, launching him backwards. Not only did it aggravate the wounds he already had from the small black Heartless from earlier, but it knocked the wind out of him. But it did pull his Keyblade free from its own leg, and he did manage to keep hold of it. He climbed back to his feet after only a moment, ready to hit that thing again. He had been in his fair share of fights. He knew how to take hits, fight through pain, and win against impossible odds.