Attack the huge piece of debris near that corner for an Emperor’s Crown.
Mahoraga may seem harder in the first fight but once you kill all the henchmen you’ll see how difficult Mahoraga is. If you saved up the MP to do a Cavalier summon you may be able to avoid this, but basically Mahoraga will shoot you with Icicle Breath and then move so far away that you can’t counterattack him. Because of this, when he comes in to attack spread your characters out to prepare for his retreat so at least someone is near him. It can be really frustrating for characters like Cho Hakkai who will rarely get a shot in. Rely on your long range attackers and your magicians (who are likely out of MP and may need Magic Potions). It’s a grueling fight but you’re fighting a devil in real form.
Afterwards Mahoraga rejuvenates himself and teleports but is really injured. His devil mates find him and vow not to tell Asura about his defeat.
Midnight Tor
There are some really nice things to buy here as usual. And as usual you likely won’t be able to afford it all, but I especially like the group strength fire magic spell in the specials. Don’t forget you can sharpen your weapons again this time to level 5.

Have you ever wondered about Sanzo?
Great guide