Overview

General Tactic

Outstall and outheal him.
Use Five Elements so his Megidolaon gets reflected back to him.
Use Megakin to enhance this damage.
Protect yourself with buffs and debuffs.
Have a lot of Units with Heal.
Use Alilat with Repel Fire Demons, so he loses Press Turns when using Trisagion on your Repel Fire Demons.
- Teal Jeanne d'Arc, Yellow Amaterasu, Garuda and Teal Thor are recommended.
Use first Team as bait so your main team can setup Buffs and 5E first.
- If you can actually outspeed him, do that to deal some damage.
He can heal nine times. After that, the chance of him using Megadolaon multiple times per round is increased
- As such, try to close the fight before that.
Be prepared to restart and try this fight a lot. Fifty Retries is not uncommon.

Maaster:

Team 1 (Templar):

Purple Fenrir 5*
- Double Speed Set with Speed%
Hell Biker
- Tarukaja Transfer
Purple Yoshitsune
- Charge and Phys Boost Transfers
- War and Aim Sets with PAtk% Focus
Garuda
- Speedster Transfer

Just used Fenrir and Garuda to hit Speed cap.
Order was Garuda-HB-Fenrir-Yoshi
- Pass->Red Zone->Pass->Charge->Pass->Tarukaja->Pass->Hassou Tobi

Team 2 (Megakin):

Teal Amaterasu, 2.3k HP
- Didnt have Shifters left
- Diarama and Samrecarm Transfers. Diarama rarely cast as Tenson Kourin and Tarunda was more needed.
- Divine and Shield Sets with full HP% Focus
Huang Long, 3k HP
- Endure and Speedster Transfer, Speedster not needed, could go for Life Gain or Enduring Soul
- Life Set with HP% Focus
Teal Jeanne d'Arc
- Tarunda and Diarama Transfer
- Life and Heal Set, Hp% and Heal% Focus
Alilat
- Rakunda and Life Gain Transfers
- Life Set with HP% and Healing% Focus. Heal Set as second Set works too.

Order was HL-Jeanne-Alilat-Ama
- Most Turns were: Pass->Diarama->Pass->Buff->5E->Pass->Diarama/Debuff , depending on how injured my demons were.