The Heavenly Ikuyumi animation is so long...
I know Nuwa's base level is 80, not 82 but this can be done exactly the same without those 2 levels.
I felt bad for posting such a rubbish Demi-Fiend clear a few days ago, especially since it used a very boring strategy that was very similar to the quick Demi-Fiend fight in base V. My new strategy was inspired by my Satan clear and is something that could only be done in Vengeance: the innate skills of the 7 demons used are all essential to the clear and the move and charge status I use are new to Vengeance.
Let's go over the team composition:
Nahobino (219 Magic)
His role is to build Magatsuhi bar and delete Demi-Fiend's health bar.
Skills:
Heavenly Ikuyumi - Contender for the best skill in the game, very good damage and doesn't require special set up since you always want max debuffs anyway.
Evergreen Dance
Both almighty pleromas
Both glee skills to increase crit rate
Abyssal Mask to prevent poisoning from Girimakhela using toxic cloud.
The essence used here is pretty important. In the video I used Demi-Fiend's essence thinking it didn't matter, however I have found out that your essence does play a pretty large role. If you have no dark nulls on your team then Girimakhela will always use Mamudoon and if you have no force nulls then Pixie will always use Mazandyne, otherwise they will act randomly as described (note that Nuwa's resistances aren't taken into account by the enemy as she was switched in). This can be used to our advantage if we want a more reliable strategy than what I showed in the video. Ideally, Nahobino should be equipped with Vishnu's essence (to null phys and dark) and Nuwa should use a force dampener on her first turn. This takes care of any Pixie randomness and leaves Girimakhela and Cu to act as I describe later. Alternatively you can put Girimakhela's essence on MC (it's buyable from Gustave) and assign null dark to MC, Baal or Yoshi, this will make Girimakhela use his "random" AI. It's best that Baal does not have drain force. You ca see this improved strategy here:
th-cam.com/video/ir-bPpQZKh0/w-d-xo.html
Nahobeeho
His only purpose is his innate skill which decreases the cost of using Omnipotent Succession. The amount of bar saved by this skill can vary and sometimes it doesn't save enough to let the bar fill up on turn 2, If the red bar is around the M on Magatsuhi then you have enough.
Yoshitsune
He also only exists for his innate skill to give an extra turn but we also need to kit him out with some skills from essences to survive, these are: null phys, enduring soul and endure
Baal
Needed for access to the racial skill Charge as well as his innate to generate extra press turns when he's debuffed. He has null phys (necessary) as well as
life spring which I don't think is necessary.
Nuwa
The star of the clear in my view. The reason I use her is because of her innate skill which generates an extra press turn whenever she resists or nulls two or more attacks on the enemy turn (it has to be resist or null and not repel or drain to activate). She is quite capable of handling the Demi-Fiend's attacks with both endure skills and great life spring, she also needs resist phys for her innate to activate. Mastema would be more reliable than Nuwa here but he's NG+ exclusive.
Kresnik
His innate skill is debilitate x4 whenever an ally dies, it's very good.
Kudlak
His innate is luster candy x4 whenever he dies, it synergises very well with his archenemy's skill which is strange but I won't complain. He needs a physical skill to be able to deal enough damage to himself and safeguard so I don't lose ally turns when the attack gets reflected.
Sandalphon
His existence allows me to crit with Heavenly Ikuyumi. As strong as MC is, he needs to average 2500 damage per hit for this clear to work and he can't do that without crits.
A lot of demons have null phys, to get this skill fuse Ongyo-Ki into an element demon and give it null phys, register that element into the compendium and then use it as an ingredient.
There is an annoying amount of randomness in this fight. I've already mentioned how the amount of Magatsuhi preserved by Nahobeeho and the skilful conversion miracle is random but Demi-Fiend's allies also move at random. Cu Cullain can use megidolaon (bad), a fatal sword on Nuwa (ok) or debilitate (very good). Girimekhala can also use megidolaon or debilitate and can also use toxic spray or toxic cloud. As long as either of them use debilitate or if Girimekhala uses toxic spray on Baal then the clear will work.
It doesn't matter what Pixie does except she can't use zanbarion on Nuwa if Cu Cullain didn't attack Nuwa and Girimekhala didn't debut Baal, their innates don't activate otherwise.
What happens on the next player turn is pretty self-explanatory though I will say that an ikuyumi crit will only generate an extra press turn if it is the first of the group of 4, this can be helpful if you failed to activate Nuwa or Baals innate skills.