Summoning looks like a pretty OP magic skill. Especially with the dragon doors. And now I also understand the "big bad", but it's possible that it's also a big misdirection and future him is the big bad instead. *shrugs*
No Eris this chapter, but if he follows the advice of future him, she'll become wife #3. That Armored Dragon guy was pretty badass also. I keep wondering where the laughing Demon King dude went, but I've been wondering that ever since he first disappeared. I'm sure we'll learn soon enough. Also, up until the end of this chapter, I kept thinking that Cliff was going to be the big bad. I guess not, though. There's really no reason why I thought that, but I did anyway. It looks like he done fucked up by rescuing his mom, but he got Roxy out of it. But he could have had both beast princesses instead, so there's that... Oh well.