Momiji's looking at a baseline of 43 MP (18 base, +20 from Orbs/Gems, +5 from MP Boost) so she generally shouldn't be running out of MP with Rabies Bite, she can use it 14 times consecutively. Samidare Slash is kind of expensive at 6 MP, but it's a horrible spell card for damage, I would strongly recommend using Kogasa's Drizzling Large Raindrops or Nitori's Kappa's Illusionary Waterfall instead. Mystia's got a baseline of 53 MP (28 base, +20 from Orbs/Gems, +5 from MP Boost), so she's getting 10 uses out of Midnight Chorus Master. It's only a bit stronger than Rabies Bite under ideal circumstances, but it's not really the kind of attack you need to use 10 times in a boss fight. Things like exploiting the boss' weakness, Boost effects, anything you can use to boost the damage of each spell card also boosts MP efficiency, and that's important. You don't need to restore MP if you do so much damage so efficiently that the boss goes down before you run out of MP, and that's something you can realistically do. Trying to prepare for long-term combat actually ends up setting you up to more likely require it since you're doing less damage per MP spent by doing that. Like with Hexer Chen, doing that is sacrificing the ability to use Transcendent, Warrior, or the special subclass, so you're losing out on a lot of damage you could be doing and making it so that you're more likely to need MP restoration than you otherwise would.
But if you do find yourself wanting or needing MP restoration, Keine gives infinite MP for Instant Attack characters since the skill only cares if Keine's in the front, not if she's the one switching. So you can switch between two Instant Attack characters until they're both at full MP. Momiji and Chen would max out Accelerate doing this, Momiji would also max out her DEF/MND buff too. This destroys their other buffs though, so you'd need to buff them up again. Your frontline would look like Keine/Kogasa/x/IA user probably, Keine can handle ATK buffs and is decently effective at MT healing as an Enhancer, or maybe even go Herbalist with her. Kogasa is probably the best bet for Strategist since she isn't really doing anything besides sit and switch. Third slot would probably be another support character (healer, damage booster, etc) or another attacker. Since Kogasa should be busy switching the IA user, it's probably best to use a character that doesn't have Instant Attack as the secondary attacker, since you can't use the skill as effectively.
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This is not particularly related to the conversation at hand, but I thought I might give a bit of an overview of damage calculation to draw a picture of the importance of ATK/MAG buffs, and to provide a sort of foundation for others to try to calculate their own damage. The basic damage formula is basically
Damage = (Attack Power - T.Defense Power) * Multiplier * (100 / T.Affinity) * Random Number (
any number between 0.9 and 1.1)
Think most people know what this stuff means so I'll skip more into a practical example of calculating an attack. I'll use Tenshi as an example (naturally), for her World Creation Press. For practical purposes, here's what her stats look like at the point of the game I'm at.
https://i.imgur.com/Dwo5acr.jpgSubclass: Murakumo's Blessing
Main Equipment: Divine Sword Falchion (+20% damage when attacking elemental weaknesses, ~80 affinity)
Sub Equipment: Long Sword "Crimson Lotus Princess" x2, Scourge
So she has 400770 ATK.
Damage = (400770 - T.Defense Power) * Multiplier * (100 / T.Affinity) * Random Number
For the sake of ease of reading, I'll be assuming that T.Defense is 1m (1000000), T.Affinity is 100, and Random Number is 1.
World Creation Press is a (164% ATK - 50% T.DEF) * 164% spell card formula. With a level 5 spell card, the damage multiplier is further increased by 20%.
Damage = ((400,770 * 1.64) - (1,000,000 * 0.5)) * (1.64 * 1.2) * 1 * 1
Damage = (657,262 - 500,000) * 1.968
Damage = 157,262 * 1.968
Damage = 309,491
The final Infinite Corridor boss has 84m HP, so this would take off 0.36% of its HP. That is scratch damage and would take 278 hits to defeat the boss. Thankfully, that is the minimum possible damage pretty much. Next, adding ATK buffs. The Enhancer subclass provides a 37% ATK/MAG buff. With the typical decay of 20%, this buff becomes 29% upon taking a turn. So let's assume a 29% ATK buff. With 400770 ATK, a 29% ATK buff is 516993 ATK, which is 116223 more ATK.
Damage = ((400,770 * 1.29 * 1.64) - (1,000,000 * 0.5)) * (1.64 * 1.2) * 1 * 1
Damage = (847,869 - 500,000) * 1.968
Damage = 347,869 * 1.968
Damage = 684,606
This is 0.81% of 84m, and a 121% damage increase from having no ATK buff. So a 29% buff adds 121% more damage in this context. With a Strategist available, the decay rate of 14% would mean that Tenshi would have a buff of 31% on her instead of 29%. This is marginal, so I won't be calculating that. Instead, I'll calculate with a second Enhancer buff. With a 29% buff, the +37% buff puts the total buff to be 66%. With the 20% decay rate, the buff when Tenshi takes her turn will be 53%. A 53% ATK buff to 400770 ATK puts it at 613178, which is 212408 more ATK.
Damage = ((400,770 * 1.53 * 1.64) - (1,000,000 * 0.5)) * (1.64 * 1.2) * 1 * 1
Damage = (1,005,612 - 500,000) * 1.968
Damage = 505,612 * 1.968
Damage = 995,044
This is 1.1% of 84m. Compared to having no ATK buff, the 53% ATK buff is a 221% damage increase. Compared to the 29% ATK buff, the 53% ATK buff is a 45% damage increase. As you can immediately tell, there is an enormous damage % dropoff at this buff level, but 45% is still an enormous increase. Skipping ahead a bit, let's assume Tenshi's has a 100% ATK buff and now takes a turn with 20% decay. She now has an 80% ATK buff. 400770 ATK with an 80% ATK buff becomes 721386 ATK, a 320616 ATK increase.
Damage = ((400,770 * 1.8 * 1.64) - (1,000,000 * 0.5)) * (1.64 * 1.2) * 1 * 1
Damage = (1,183,073 - 500,000) * 1.968
Damage = 683,073 * 1.968
Damage = 1,344,287
This is 1.6% of 84m. Compared to having no ATK buff, the 80% ATK buff is a 334% damage increase. Compared to the 29% ATK buff, the 80% ATK buff is a 96% damage increase. Compared to the 53% ATK buff, the 80% ATK buff is a 35% damage increase.
Thus, you can see how there's a diminishing return on further stacking ATK here. Next, let's try stacking % boosting skills. First, let's start with adding a Strategist to the frontline. Furious Scheme increases damage by 10%. Very simple. Inspirational Plan also cuts down buff decay rate from 20% to 14%, so a 100% buff goes from 80% to 86%, so that should be taken into account here as well.
Damage = ((400,770 * 1.86 * 1.64) - (1,000,000 * 0.5)) * (1.64 * 1.2 * 1.1) * 1 * 1
Damage = (1,222,508 - 500,000) * 2.1648
Damage = 722,508 * 2.1648
Damage = 1,564,085
This is 1.8% of 84m. Compared to the 80% ATK buff, adding a Strategist increased damage by 16% (the additional 6% being from the higher ATK buff). Skipping some steps, adding an Herbalist's Herb of Awakening for a 36% damage boost results in
Damage = 722,508 * (1.64 * 1.2 * 1.1 * 1.36)
Damage = 722,508 * 2.944128
Damage = 2,127,156
This is 2.5% of 84m. With the current damage output, the boss would take 40 hits to defeat. Still pretty terrible, but there's still the Murakumo's Blessing multiplier. Three Swords of the Divine Era grants a 16% damage boost for every character that can spend MP on the subclass holder's attack. In total, 1.16 * 1.16 * 1.16 = 56% more damage.
Damage = 722,508 * (1.64 * 1.2 * 1.1 * 1.36 * 1.16 * 1.16 * 1.16)
Damage = 722,508 * 4.595477618688
Damage = 3,320,269
This is now 3.9% of 84m, which would take 26 hits to defeat the boss. Now, we're starting to run out of the universal damage boosts, so let's look at character specific things. Tenshi has Girl of Bhava-agra, which is a 40% ATK boost if Iku is at the front.
Damage = ((400,770 * 1.86 * 1.64 * 1.4) - (1,000,000 * 0.5)) * (1.64 * 1.2 * 1.1 * 1.36 * 1.16 * 1.16 * 1.16) * 1 * 1
Damage = (1,711,512 - 500,000) * 4.595477618688
Damage = 1,211,512 * 4.595477618688
Damage = 5,567,476
This is now 6.6% of 84m (and a 67% [wtf so high] damage increase), which would take 16 hits to defeat the boss. This is now a somewhat manageable fight, but the damage can still be further improved. Next, adding Courageous Sword's buff. It's a bit impractical to assume that Tenshi also has her DEF/MND at 86% when her ATK is at 86%. Instead, since Tenshi starts out with 33% ATK/DEF buffs with Enduring Celestial, let's assume that. 33% + 33% / 5 = 13% more ATK.
Damage = ((400,770 * 1.86 * 1.64 * 1.4 * 1.13) - (1,000,000 * 0.5)) * (1.64 * 1.2 * 1.1 * 1.36 * 1.16 * 1.16 * 1.16) * 1 * 1
Damage = (1,934,008 - 500,000) * 4.595477618688
Damage = 1,434,008 * 4.595477618688
Damage = 6,589,951
This is now 7.8% of 84m, and an 18% damage increase. At this point, the boss takes 13 hits to defeat. The last thing Tenshi has that can boost her damage is Keystones of Spirit, which requires striking weakness, so skipping that for now. 13 hits is pretty reasonable, but it can still be further reduced. The last important boost that isn't reliant on the boss' weaknesses or race is the elemental damage boosting skill. Suwako is not realistically going to be on the frontline, but this is just for damage calculation purposes. Froggy Power! gives a +30% boost to NTR element attacks.
Damage = 1,434,008 * (1.64 * 1.2 * 1.1 * 1.36 * 1.16 * 1.16 * 1.16 * 1.3)
Damage = 1,434,008 * 5.9741209042944
Damage = 8,566,937
This is now 10.1% of 84m, and a 10HKO on the boss, all the way down from the original, buffless 278HKO. This is a pretty satisfactory and practical amount of damage to aim for. The Herbalist's 36% Boost can be switched out for Akyuu's +50% Boost, and Miko and/or Maribel can further add to the damage with their Awakening skills, but a 10HKO is good.
For an attack that isn't even hitting weakness.
Damage = 1,434,008 * (1.64 * 1.2 * 1.1 * 1.36 * 1.16 * 1.16 * 1.16 * 1.3) * (100 / 60)
Damage = 1,434,008 * 5.9741209042944 * 1.667
Damage = 14,281,084
17% of 84m, a 6HKO. This is on a 60 affinity, which most bosses have. Of the Infinite Corridor bosses for example, only 2/10 of them do not have a 60 weakness (Abyss Marisa is probably 88 like her playable counterpart, Abyss Rinnosuke is 80 and counts as a weakness). For the maximum possible damage multiplier, adding Akyuu to the frontline so that it's Iku/Akyuu/Suwako/Tenshi (with one being a Strategist), replacing Herbalist's 36% Boost with Akyuu's, and adding her 16% weakness boost with the Divine Falchion's 20% weakness boost,
Damage = 1,434,008 * (1.64 * 1.2 * 1.1 * 1.5 * 1.16 * 1.16 * 1.16 * 1.3 * 1.2) * (100 / 60)
Damage = 1,434,008 * 7.906924726272 * 1.667
Damage = 18,901,435
22.5% of 84m, a 5HKO. At this point, there isn't much reason to further attempt to maximize damage, but it's still yet possible by maxing out Tenshi's DEF/MND buff (a 34% ATK increase with 86% DEF/MND instead of 13% ATK with 33% DEF/MND), accounting for Keystones of Spirit (4% more ATK for every time she hits a weakness, for a maximum of 28%), and adding Maribel (with buffs, 12.5% more ATK) and Miko (8% stronger buffs, 86% buffs become 92% buffs like this) to the back. This maximum possible damage is
Damage = ((400,770 * 1.92 * 1.64 * 1.4 * 1.34 * 1.28 * 1.125) - (1,000,000 * 0.5)) * (1.64 * 1.2 * 1.1 * 1.5 * 1.16 * 1.16 * 1.16 * 1.3 * 1.2) * (100 / 60)
Damage = (3,409,067 - 500,000) * 7.906924726272 * 1.667
Damage = 2,909,607 * 7.906924726272 * 1.667
Damage = 38,351,074
45.6% of 84m, and a 3HKO.
Never going to happen, but it's the theoretical maximum with these stats. It has no practicality and shouldn't be aimed for of course.
Actually it can go even higher with a -50% DEF debuff but I'm done.Anyway, the point of all of this was to give an idea of the exact value of damage buffs and the effect stacking them has, as well as to give a damage calculation model that's hopefully practical to duplicate (I'd recommend using a spreadsheet or something instead of manually calculating it though). With good stacking you can generally down a boss in 5-10 hits. In practice it'll always take more than the theoretical amount since it takes time to get all your buffs active and you'll usually not have them all maxed out (stat buff decay is the main reason for this), but it's a fairly decent target to aim for I think. Hope the whole thing was easy to understand, sorry if it was a hassle!