Here is a Free to Play solution for this weeks Resonant Battles Week 78.
As expected for any week with Reginn, this week was a breeze. However they definitely stepped up their game for book 2 units. Up until now this week would have had units like Loki and 2 Yllgrs and 2 Hellbindis, which would be easy. But now we have units like Ascended Fjorm, and the 2 Dragons which are much tougher opponents. However we got kinda lucky on this, as Leagjarn is position within the buff range of Hellbindi, which would normally be a super powerful combo with her refined Niu, however because Reginn is Panic Smoke all her buffs are turned into debuffs, making her much easier to deal with.
Also I found it hilarious to cross the mountain at the end 3 times, especially with units that are clearly not meant to do that xD.
If you have any questions or problems with the solution, leave me a comment and I will answer to the best of my ability. #Balthiar #FireEmblemHeroes #ResonantBattles