Just for fun I thought I'd boot up Nocturne and see what my final save before the end of the game was like:
Time: 71:25
Main Character: lvl 99 999hp 393mp
(NOTE: His level is higher than 99, and I'm not sure how high, since you continue to level above 99 but it just says 99, I'd guess he is maybe 110-120)
- Focus - 5 MP - Phys attack damage more than doubles on next turn
- Might - Raises odds of critical hit
- Avenge - Enables random counterattacks Heavy damage
- Deadly Fury - 319 HP - Type: Physical, High odds of critical, All enemies
- Pierce - Phys attacks become 100% effective: subject to repel
- Spiral Viper - 159 HP - Type: Physical, 1 enemy
- Freikugel - 169 HP Type: Almighty, 1 enemy
- Life Surge - Raises MAX HP by 30%
Black Rider: lvl 76 696hp 452mp
- Glacial Blast - 25 MP - Type: Ice, Heavy Damage, Random enemies
- Bright Might - Phys attacks will be always critical at full Kagutsuchi
- Pierce - Phys attacks become 100% effective: subject to repel
- War Cry - 40 MP - Lowers Physical/Magic attack greatly, All enemies
- Mediarahan - 35 MP - Heals HP fully, Entire party
- Debilitate - 48 MP - Lowers attack/defense/dodge/aim, All enemies
- Mana Surge - Raises MAX MP by 30%
- Megidolaon - 50 MP - Type: Almighty, Mega damage, All enemies
White Rider: lvl 70 660hp 330mp
- God's Bow - 20 MP - Type: Expel, Fatal, 1 Enemy (very high odds)
- Prominence - 30 MP - Type: Fire, Heavy damage, Random enemies
- Focus - 5 MP - Phys attack damage more than doubles on the next turn
- Bright Might - Phys attacks will be always critical at full Kagutsuchi
- Pierce - Phys attacks become 100% effective: subject to repel
- Mediarahan - 35 MP - Heals HP fully, Entire party
- Debilitate - 48 MP - Lowers attack/defense/dodge/aim, All enemies
- Dekaja - 10 MP - Cancels -kaja effects, All enemies
Red Rider: lvl 72 672hp 336mp
- Wind Cutter - 13 MP Type: Force, Mega damage, 1 enemy
- Fog Breath - 30 MP - Lowers dodge/aim greatly, All enemies
- Pierce - Phys attacks become 100% effective: subject to repel
- Bright Might - Phys attacks will be always critical at full Kagutsuchi
- Mediarahan - 35 MP - Heals HP fully, Entire party
- Bolt Storm - 25MP - Type: Electric, Heavy Damage, Random enemies
- Dekunda - 10MP - Cancels -nda effects, entire party
- Avenge - Enables random counterattacks Heavy damage
My basic strategy for the Lucifer if I remember was to debuff (keep it up when it was removed by Lucifer), heal when needed (very easy since any one of my three can heal everyone fully), and then have my main character and White Rider use Focus one turn and attack the next for really high damage (more-so from my main character since he did way more damage than the other party members), everybody else just physical attacks since with Pierce they will do normal damage with those attacks.
Bright Might was just on there for earlier encounters since with that on you can run around before a boss till it is Full Kagatsuchi then fight the boss and you always get to take 7 turns (since Kagatsuchi doesn't change in combat so you are guaranteed criticals), doesn't work on Lucifer though since there is no Kagatsuchi phase for that fight.
To get Pierce on I actually had to remake my party (I already had a party of 3 Riders but they had all skill slots full already and were in their 80s so when I got access to Pierce I remade them (and added the healing spell to all of them this time), and then ran around for a long time power leveling in the final dungeon because Riders start at like 50ish) stopped when they hit around 70 and decided to see if I could win, and I did.