[The sun seems to help, indeed. Once they're outside, Centarumon leans against the ruin wall again, steadying himself.]

I would imagine he is the great evil we've heard of in legends, who wants to enslave this world... Other Digimon have experienced the same phenomenon, so it's likely that I was another step on his ladder.

Although....my position as protector of these ruins may also have something to do with it.