So you made the decision to fight Satan in DDS2. God have mercy on your soul. But if you're still willing to do it, here's tips on how to not get destroyed

The party setup

Preferable party is Seraph, Cielo and Argilla in this order. You want all of them to be at or rly close to 999 HP and you want Cielo to have the lowest magic stat. Note this guide doesn't assume you're level 99, you can be lower but then you definitely wanna be at 999 HP after life increasing skills.

There's two ways you can build Seraph - Divine Light physical attacker or Titanomachia magical attacker. I'll go over the magical approach here as for reasons I'll explain later it's much safer - especially important when tackling Satan at low level.

Seraph - Equip Turn Ring, Skills: Titanomachia, Mind Charge, Salvation, Life Surge, Life Gain, Void Death, Void Charm, Earth Amp. Earth boost can replace either Life Gain if you have 999 HP even without it or Void Death if you have like 25 death shields in item form.

(Physical Seraph skillset: Divine Light, Power Charge, Salvation, Mind charge (for combos), Life Surge, Life Gain, Void Death, Void Charm)

Cielo - Equip Synchro Ring, Skills: Salvation, Void Charm, Void Death, Life Surge, Life Gain, Life Bonus, Tarukaja, Tarunda.

Argilla - Equip Avoid Ring (stack with +vitality gems, helps her reach 999 HP), Equip Pandemonium ammo. Skills: Life Surge, Life Gain, Life Bonus, Human Form (New Cycle+ only, not mandatory, it just helps on turn 1)

Satan Patterns:

The main mechanic of the fight is that every 4th turn, he uses God's Breath, which is an instakill, UNLESS at least one party member has +3 in every single buff. This makes Charge a mandatory combo and is Cielo's main role in the fight.

Satan can always cast: Mamudoon, Mahamaon, Debilitate, Vanity, Megidolaon. Argilla wants to revert turn 1 with the Avoid Ring to block all potential Mahamaon combos into a death as well as not giving Satan turns by exploiting weaknesses.

Satan NEVER uses any physical moves.

Satan can only casts Dekunda if he's at -3, but he's not guaranteed to do it instantly, it's just a chance. This is why magical Seraph attacker is preferred - you can keep Satan at -2 and lower his attacking power a lot.

If satan gets extra press turns, he uses buffs. This should never happen with this setup.

Satan has shifting resistances. According to GameFAQs research, which is reliable in this case:

Permanent 50% Almighty resistance. Not worth using any almighty because of this.

Turn 1: Physical (bullet) is reflected.

All elementals are fair game.

Turn 2: Fire, ice, electricity are reflected.

Physical, bullet, force and earth work.

Turn 3: Ice, electricity, and force are reflected

Physical, fire and earth work.

Turn 4: Electricity, force and earth reflected.

Physical, fire and ice work.

What's important: Earth works on

turns 1-3. Phys/bullet works on 2-4.

Note - Turn 4 means "after satan casts dekaja", since Satan starts the fight, so your turn 4 comes after HIS turn 4. Same for all the other turns.

Satan has 30000 HP, he starts off the fight by using regular -dyne spells. Turns 1, 2 and 3 are free of any supermoves, Turn 4 is Dekaja/God's Breath.

After falling below 15000 HP he uses Temptation, UNLESS it's a Dekaja turn. Then he proceeds to use Temptation on Turn 1. It's a 100% charm almighty move, so Void Charm is necesarry to throw up. Replaces -dynes with heavy random target moves like Explode. Turns 2, 3 are still free.

After falling below 7500 HP, he starts using Retribution on turns 2, 3 which is an unavoidable instakill which targets the lowest magic character. If it's tied, he rolls at random, therefore you want Cielo to have magic at the lowest, to eliminate RNG. He replaces heavy random target moves with ma-dynes.

At 1500 HP or lower he uses Diarahan. He'll still use everything from the prior phase, so just reset if this happens. Obviously you wanna burn him beforehand, Impel Stone really helps here.

A couple of notes about the fight:

- On turn 1 of the whole fight (aka after Futility) you wanna get in 2 charges with Cielo and untransform Argilla (if no Human Form).

- Before attacking Satan for the first time, you wanna be at +3 and use Debilitate combo twice, to set him at -2 for the rest of the fight.

- Prioritise putting up Void Death shields, if Void Charm isn't required. It makes the fight safer.

- Never use a Magic Repel / Magic Mirror. If you wanna see why, try it.

- Keep good track of how much damage you deal. A calculator is nice.

- Bring a healthy supply of revival items. Note that Revival Beads are actually viable for reviving if you use Salvation afterwards, or on Cielo between Retribution casts.

- Make sure to have MP restoration like Great Chakras and Somas. You won't need too many of them but one/two is risking it.

- Have dis- items at like 10-20 (except ache ofc) - sometimes vanity will prevent a salvation cast but will allow an item cast on another character.

- Make sure to remember about his changing repels. Never attack with Titanomachia right after Dekaja or with Divine Light after Temptation.

- When you wanna finish off Satan past his Diarahan, do it when you're on turn 3 and at +3 buffs. That way Argilla can cast the Impel Stone and you'll get more turns off with Seraph.

Please note this still has a failure chance due to RNG, However, with the magical approach I feel like this is as much as one can mitigate RNG in this fight. Good luck out there.