GamePress
Another spoiler ahead!
Apparently the dataminers did not get this. It's from Gamepedia. Micaiah & Sothe Bound Hero Battle Map. A replica of Part 1 Endgame: Daein, Arise! of Radiant Dawn, but I didn't expect that there would be so many trenches. So I recommend not bringing cavalry here.
Edit:
I'm also feeling that the NPC's will replicate the Dawn Brigade:
Sword Unit (Edward) - Slaying Edge and Wrath
Axe Unit (Nolan) - Will probably have Guard (to replicate Nihil)
Bow Unit (Leonardo) - Wind or Watersweep (Cancel)
Lance Armored Unit (possibly Tauroneo) - either Brazen Atk/Def or Atk/Spd (came with Resolve)
https://feheroes.gamepedia.com/Micaiah_%26_Sothe:_Bound_Hero_Battle#Infernal

Fate Grand Order
Dragonball Legends
IV Calc
Heroes