User blog comment:B214/Volume 21 info & spoilers/@comment-213.120.234.130-20160325144049/@comment-73.160.58.215-20160325193635

Indra is almost certain to be the major opponent of the final arc, though I do like the idea of Hades acting up again now that his deterrents are gone. However, I feel taht we're likely to see the Malebranche taking a similar role to the Evil Dragons in this arc (unless they turn up as enemies in the SlashDog web novel), since their name has been on the info list on Ishibumi's blog for some time now without them appearing.

---ShadowDragon