Oh, if you're using what's presumably a glitch to stack buffs in order to get huge numbers on Youmu, then that point is kind of moot. At that point, anyone could do big damage, so it kind of doesn't really matter.
Seems like you misunderstand my post. Since the screen shot is of the party having both Byakuren and Sanae in it with Mokou, the glitch may have been used, whether intentional or not.
This is also why I wanted to do a real test with Youmu using the Turtle smasher vs Biotopos. Youmu's Slash of Eternity has defense ignoring properties and Turtle Smasher, being an axe, also has defense ignoring properties. I don't know if they stack or not, but that will matter.
If Youmu's punching through 1111 defense and still hitting for 40k with Slash of Eternity, yes, it definitely is that powerful.
A lot of Youmu's attacks ignore defense. It has defense ignore 35, which I assume to mean it ignores 65% of the enemies defense. You could correct me if I got this part wrong. 1111 defense goes down to 390 defense. I could be reading this wrong, but I am basing this off the other skills that completely ignore defense and they get labelled defense ignore 0. Hitting 40k against the Terminator is feasible.
@Mokou and Youmu's numbers: Now that I got their numbers clearly, I understand how the calculations work.
Mokou's Fujiyama Volcano: Power - 3.5, Multiplier - 1.01, Fire Element Damage added - 100%, Fire Element Strength - 150%.
If we assume Mokou to have 470 attack power, you get these numbers on enemies with no resistance to fire.
470 * 3.5 * 1.01 = 1295 + (1295 * 1.5) fire damage = 4154
This also means that against enemies resistant to Fire, Mokou's damage is greatly nerfed. Since more than half the damage comes from Fire. At least according to what is being said.
Youmu's Slash of Eternity: Power - 1.05, Multiplier - 1.5, defense ignore - 35, 3 to 5 hits, 100 critical (I think this means +100% to critical hit chance, but I don't know).
If we assume Youmu to have 440 attack power, you get these numbers.
440 * 1.05 = 462 * 1.5 = 693 * 4 = 2772. Criticals were not used for the math. Remember, Youmu's critical hit damage is x3 or so and other people's critical hit damage is x2 or so.
These numbers favor Youmu's damage output for most boss encounters when you include critical hits, which Youmu does a lot more than other characters. This includes Mokou with the Phoenix Hand, which has +20 critical hit.
I have also tested this against the Godeater who has 0 defense and 0 m defense, weak to fire 2x, and it looks about right.
Mokou's regular damage was about 1200. Mokou Big Fujiyama Volcano was about 25k. The numbers say it should be about 27k, but that's close enough.
@3 party split: Yeah, I would split to 3 parties of 4. I generally keep a caster in every party and Sanae goes with the party that has enemies with a bunch of status effects.