We'd discussed this on plurk, but I would love Mateus to approach Dante given how much darkness he's got in his heart. (Joke's on Mateus though; he controls it, not the other way around!!) I'm good with however you want this to go down, whether it's just Mateus trying to sway Dante to its side and Dante rebuffing it/fighting and then chasing after it (and losing it probs, since you've got your last encounter planned out?) or it actually managing to latch onto one of his insecurities and promising to help, or any other option you think would be fun? :) Since this is your plot, I'm up for whatever will be most fun to play out with their CR!