SMT: Vengeance Satan Hard Mode Quick Clear (New Game, No Sutras/Incenses) 8 Turns

Omagatoki: Charge is good.
IMPORTANT: This strategy can also be done with a base level Norn provided she has both endure and during soul. If you do this you may need force sutras or magic essence on Baal.
The Satan fight has heavy scripting and it generally goes like this if he's allowed to use all his turns and none of his summons die.
Turn 0: summon allies then megido ark.
Turns 1 and 2: almighty move (either megido ark or megidolaon), his allies move, then he does another almighty move.
Turn 3: Magatsuhi plunder, remaining allies move, charging the magatsuhi skill of whoever he ate (this takes all his press turns no matter how many he has).
Turn 4: Using whatever Magatsuhi move he charged, any remaining allies move, then call allies.
Turn 5 onwards: repeat from turn 1.
If you interrupt his press turns during turns 1 and 2 then carries on with the script as normal. However, if you interrupt him in turn 3 or 4 then he will use whatever move he would have used on his previous turn, had he been able to use it. For instance, if he uses accursed poison as a Magatsuhi move but it costs him more than one turn (say you're using Demi-fiend who blocks all ailments) then he will use call allies on the first action of his next turn.
While it's not necessary for this video I should also mention that he will use call allies on turn 1 or 2 if you killed one, I don't know how that interacts with the rest of his "script".
With this knowledge and the chaotic will skill from Demi-Fiend to half his press turns, we're able to significantly draw out how long Satan spends turns doing idle (Magatsuhi plunder, using a useless Magatsuhi move like shield of God or Dekajaon, or using call allies). This gives us enough time to charge up the Magatsuhi bar.
We also rely on an AI quirk that has to do with the 100% dodge skill Luminescent Mirage. Presumably the devs didn't want the MC using taunt + dodge to avoid megido ark so if you use the dodge skill on turn 1 or 2 then he will always megidolaon instead. If we use chaotic will to half his press turns when he uses megidolaon then we only have to deal with one attack on turns 1 and 2.
The party order is essential here as are the exact demons used (Baal can be swapped for figment slash Odin but he's much less reliable). Yoshitsune returns from the Demi-Fiend fight to deliberately miss and proc his innate skill, Norn's innate skill is used to grant an extra half press turn on the charge turns, Beelzebub's innate skill is used to get twice as much value from debilitate, Baal is a good high level Deity with force affinity and
only Demi-Fiend has chaotic will and he does good damage as well.
As for the fight itself, megido ark will kill anyone on turn 0 so endure/enduring soul is a must for all your demons. I would have put it on MC as well but he needs all his skill slots for other things so I had to make do with a whittled goat.
It is essential that we kill Hariti before turn 3. This is because it seems random which demon he eats (if you know what causes him to eat which demon please tell me) and him using waters of youth would obviously be very bad. It would also be bad to let any of his summons ever get an action because they like to use (de)buff skills or dekaja/dekunda.
MC's skills:
Figment Slash
Evergreen Dance
Luminescent Mirage
Critical Zealot
Both Phys Pleromas
Dragon Eye
Safeguard
I'm not sure whether beast eye would have been better than safeguard, I never tested it but I suspect beast eye may be better.
I should also mention that I did not max out strength for this strategy, the MC has 170 strength and 119 agility to help with the hit rates. Again, I'm sure what the exact balance is between strength and agility but what I did works. If you had so much strength that Satan would be brought below half during the first use charge turn then he would summon 3 allies next time, which would completely ruin the strategy. You would need a lot of strength for that to happen so I doubt it would ever be an issue.
Other important skills:
Great Life Spring on Baal - this is so he can survive 2 megidolaons. Endure would also work instead.
Both force pleromas on Baal to let him kill Hariti.
Boon Boost and Boon Boost EX on Beelzebub and Norn.
Magatsuhi Wellspring Miracle- MC doesn't have enough MP otherwise (this wouldn't matter if I had +5 support affinity but I didn't have enough glory).
Every relevant Magatsuhi generation skill because the bar is really tight.
The Prayer of Magic and Vitality miracles were also used.
Of the two SMT V superbosses I've fought I'd say Satan is easier than Demi-Fiend if you were to fight them both without any kind of "cheese", mostly because you can't use chaotic will against Demi-Fiend and Satan spends a lot more turns idle. If you were to fight Satan without bursting down his health with omnipotent succession then I'd recommend Sakuya or a waters of youth demon.
If I hesitate for a few seconds then it's because I forgot what to do.

[@thecommondude]

you cooked with this strategy. Succession being counted as a charge effect is huge! kudos on the run

[@LotsoOP]

Incredibly well done! Good to see someone cook with succession and charge! Figment slash was a great choice for the skill to spam for it! Usually people just do this for OTKs so it's awesome to see it be the main source of damage because, just, WOW, is it fucking strong. The set up to bring party members back after performing the combo would have thrown me off hard, so glad to see you master that flawlessly!

[@GreatBigHill]

Read the description to get the builds and information about the fight.

[@vgFaisal]

Amazing! and I can confirm that when he summon 3 allies the strategy still works

[@bugwells]

and i thought the arahabaki teambuilds were big-brain enough as is... this strat of urs is on a COMPLETELY NEW LEVEL

[@YurificationTrademark]

Very informative, I'll look into this for my low level run.

[@Frank_Erz]

If anybody finds this just looking for an easy script to follow, I gotchu
Start: Baal, MC, Beelzebub, Demi-fiend
Stock: Norn, Yoshitsune
Items: Bead Chain x3, Purge Charm x1, Force Gem x1, Blessed Fan x1 or Light Gem x1
Bead Chains can be substituted for Mediarama + Heal Pleroma + High Heal Pleroma if Norn's Magic is high enough
Force Gem is unnecessary if Baal's Magic is high enough
Purge Charm is unnecessary if Beelzebub has Dekaja
If Hariti dies early, pass on any press turn mentioning her.
Requires Magatsuhi Wellspring, Vengeful Opportunist, Fell Swoop, Race Transcendence, Skillful Conservation, and Embolden
MC
Figment Slash
Evergreen Dance
Luminescent Mirage
Critical Zealot
Phys Pleroma
High Phys Pleroma
Dragon Eye
Beast Eye (or Safeguard if you're unlucky)
Baal
Zanbarion
Great Life Spring
Force Pleroma
High Force Pleroma
Enduring Soul
Beelzebub
Debilitate
Boon Boost
Boon Boost EX
Endure
Norn
Luster Candy
Boon Boost
Boon Boost EX
Yoshitsune
Enduring Soul
Turn 1
Baal: Zanbarion Hariti
MC: Luminescent Mirage
Beelzebub: Debilitate
Demi-fiend: Chaotic Will
Baal: Zanbarion Hariti
MC: Omnipotent Succession, Evergreen Dance
Turn 2
Baal: Zanbarion Hariti
MC: Beelzebub -> Norn
Norn: Luster Candy
Demi-fiend: Deadly Fury Hariti
Baal: Zanbarion Hariti
MC: Luminescent Mirage
Norn: Bead Chain
Demi-fiend: Chaotic Will
Turn 3
Baal: Zanbarion Hariti
MC: pass
Norn: Luster Candy
Demi-fiend: Deadly Fury Hariti
Baal: Zanbarion Hariti
MC: Demi-fiend -> Yoshitsune
Norn: Force Gem Hariti
Yoshitsune: Blessed Fan Titania
Turn 4:
Baal: Omagatoki: Charge, return to stock
MC: Figment Slash Satan
Norn: return to stock
Yoshitsune: return to stock
MC: Figment Slash until 2 press turns remain, summon Demi-Fiend (slot 4) if damage is too low to win within two more Slashes. If you're missing often, summon Demi-fiend at 3 press turns.
Demi-fiend: Chaotic Will
MC: Figment Slash if you summoned Demi-fiend at 3 press turns
Turn 5
MC: summon Beelzebub (slot 3)
Beelzebub: Purge Charm
Demi-fiend: Chaotic Will
Turn 6
MC: summon Baal (slot 1)
Beelzebub: Debilitate
Demi-fiend: Chaotic Will
Baal: pass
MC: Luminscent Mirage
Turn 7
Baal: pass
MC: Luminescent Mirage
Beelzebub: swap to Norn
Demi-fiend: Chaotic Will
Baal: pass
MC: Demi-fiend -> Yoshitsune
Norn: Bead Chain
Yoshitsune: Attack Arahabaki
Turn 8
Baal: Omagatoki: Charge, return to stock
MC: Figment Slash Satan
Norn: return to stock
Yoshistune: return to stock
MC: Figment Slash and pray
Thanks to @SpinnerTRHOG999 for some consistently improvements.

[@SpinnerTRHOG999]

Thank you very much for the very detailed script! I failed twice with this build because of bad luck, and then passed in the first try after replacing beast eye with safeguard.
Here is a slight improvement for unlucky guy like me. For turn 4, it would be better to slash until 3 press turns remain. Then summon Demi-fiend, chaotic will, and then MC does the last slash. The result is the same, but In this case it would be ok to miss the last slash. Of course it does not matter if one chooses safeguard.

[@jonathansoelle3825]

Also man i notice your only videos are vengeance so far, and i feel you i recorded a couple battles and was thinking of uploading them too. I also love using omnipotent succession and i even realized it was a charge skill because i have overwrote the standard charge effect with succession before (much to my dismay) but it had never occurred to me to use the magatsuhi charge skill to go absolutely ham on him. You are a blessing and i have subscribed

[@bambu7031]

safeguard on mc is borderline useless since satan is not a boss that dodges very much.
the difference between beast eye and not having beast eye is around a 10% hitchance for figment slash builds, which is quite massive.
safeguard prevents only the worst case scenarios, meanwhile beast eye is the more consistent option. if you miss your first hit on a beast eye build though then you might want to throw out your controller though. from my own testing, using a lvl 99 dagda and a lvl 99 odin, where dagda doesnt have beast eye but odin does - odin only missed twice in about 40+ figment slashes but dagda missed 5+ times in 40+ figment slashes.
I hope agility isnt a factor because otherwise only the devs know how the hitchances are affected exactly.

[@GreatBigHill]

I think you're right about beast eye. I put all the skills on MC before I did any testing and the strategy worked well enough that I didn't have to change it. That said it's hard to say anything definitive without any the hit rates since missing would be very bad without safeguard but you miss less with beast eye, though only the first hit of succession counts for press turn generation.
Agility does affect hit but I don't know to what extent. It's difficult to say anything definitive about strength vs agility without the exact numbers but I suspect higher damage outweighs higher hit rates to the point where going max strength is more reliable. The current setup is still quite reliable though, I never failed to kill Satan in testing.

[@KoriKitsune]

Agility is a factor. A bit a wonky one. But at least in godborn it was noticeable when I started hunting miitamas fresh out with my fresh lvl 150 miitama killers. They all even had Dragon Eye. But despite Dragon eye, they did often miss the miitamas with yabusame shot, when they had approx 200 agility in the beginning. I think once I got them up to 500 agility, they stopped missing with yabusame shot entirely.

[@bambu7031]

@@KoriKitsune i figured that would be the case but wasnt sure if the stats or levels are more important in vengeance. that might mean you want to have a higher agility stat than the enemy for optimal hit rates. maybe you just need one more agility than the enemy for maximum hit rate? I know that at least with regular attacks you wouldnt miss satan if your agility was slightly higher than satans.
but yeah, missing yabusame shots on godborn sounds like a nightmare lmao

[@KoriKitsune]

@@bambu7031 It was even funkier against godborn satan on hard difficulty, when recalcitrant execution couldnt crit satan despite all the crit buffs from various sources lol. But then Satan on godborn probs has 999 luck and my masakado had 790-ish at that time. So luck stat is pretty noticeable in godborn too.

[@bambu7031]

@@KoriKitsune I wonder if the devs actually playtested anything on godborn or the lvl 999 battles

[@ramaluminus]

Aw shucks I spoil myself, but holy, that Satan design is metal af.

[@Zephlo97]

Does Satan get different affinities depending on who he absorbed?

[@povilasl5383]

this should be possible with murakumo and stacking omagatoki critical+omnipotent succession and getting a lot of turns by using luminescent mirage and the ability to counter and add a press turn with mc

[@odinkiller727]

How do you make it so that figment slash hits so often?

[@GreatBigHill]

I use omnipotent succession on turn 1 and then I use omagatoki:charge later. Omnipotent succession is considered a charge status and they don't expire when under the effect of omagatoki:charge.
I boost the hit rate of figment slash with the skill dragon eye and max buffs/debuffs. My character also has over 110 agility.

[@kagexice7679]

What essence did you have in MC for the fight? Unless that doesn’t matter ig

[@GreatBigHill]

It doesn't matter but it was Demi-Fiends.

[@kagexice7679]

@@GreatBigHill gotchu, I manage to beat him, I didn’t have nearly as much speed as you but beast eye and dragon eye made sure I hit every single figment slash, beat him in less turns than you did

[@GreatBigHill]

@@kagexice7679 Good job on beating Satan, doing it in less than 8 turns seems tough but I guess you could use charge a turn earlier and skip the turn where I summon Norn and Yoshi if you could do more damage.
I really should have put beast eye on MC instead of safeguard but the strat worked with safeguard and I was too lazy to change it.

[@kagexice7679]

@@GreatBigHill ahh no I didn’t mean less than the 8 turn strat, I basically killed him before I reached my last 3 turns, the only difference was that I had more attack stats

[@kagexice7679]

There’s less Risk of not doing enough damage In Time

[@jaffinator2166]

Not sure if you explain it in the description (haven’t read yet) but how are you able to keep Succession active for the entire fight?
Edit: upon further research, it’s Omogatoki Charge

[@Sombrelame]

First time in the fight: wtf are these damage, this fight is impossible
After reviewing different defensive options: wait... it's completely doable
Not fond of the damage burst strat, but it's just personal preference
Great fight anyways

[@Gaerdren]

Impressive strategy and good ai exploitation!

[@ogueyratogeyrat7448]

bro dodge megidolaon