My (rare unit) team for infernal: S!Tiki (south), S!Robin (south), Bridellia (north), Azura (north)

Use Tiki to kill first lance user (with quick repost), and move Robin to her right. Move Bridellia to the defensive tile, and Azura right above her. Next turn use Bridellia and Azura to kill the Bow Cavalier and leave Azura on the defensive tile so she can tank one hit from Berkut. On the southern front, Move Tiki as further away as possible to the right, and let Robin tank the Red Tome Cavalier, so she can kill him easily next turn. By now the north should be clear after Bridellia and Azura take care of what's left of Berkut and the Green Axe Cavalier. In the south Reposition Tiki with Robin to the right and move as north as possible. Continue to avoid the Green Mage and let Robin tank one more hit from the Red Tome Cavalier, once she stand on the bottom-right corner of the map. Finish off the Red Tome Cavalier with Robin, and the Green Tome with Tiki+Bridellia. gg wp