BS2 SL1 DLC3 Boss 11(Final Boss)

Done without leveling up, taking any stat-up souls, or going into Chaos Dungeon.
Covenant is Bandersnatch
Turn 1-Third Phase: Buff everyone with as many buffs as you can with items but don't give Snow Child Madness. She is the healer and should be treated with care. If you have it, make sure to use Necronomicon and Mabel's liquor on yourself as they can give you a bit more flexibility. Switch to Twin Swords and NORMAL ATTACK. Switch to Knight's Sword and cast Knight's Pride, then switch to Bunker Guardian and Cast Soul Shield and GUARD. Use Twin Sword normal attack, SOUL SHIELD and GUARD every turn. Add INDIGNATION to your buffs in the next turn and PHALANX in the next while renewing your item buffs and healing every everyone every turn. Try to get through Phase 2 as fast as possible. The equips listed prioritizes attack as much as possible without any care for for status effect resists which second phase dishes out at an RNG basis.
Third Phase: Switch to Twin Swords and NORMAL ATTACK Unicorn 4 times. Then Switch to Anchor and cast whichever buff you're running out of first(PHALANX, INDIGNATION, etc.). Do the same for Lion. If you can't deal enough damage, try switching to Unicorn Sword and doing the last skill and the first skill to deal a lot of damage in a two actions. Use your Necronomicon if you still have it(I think there's two in a playthrough) and all buffs before last turn in the phase when you kill both
Fourth phase-end: Switch to Twin Swords and NORMAL ATTACK 4x. Switch to Anchor and renew PHALANX OR INDIGNATION or just use BERSERK if neither need renewing. If you haven't died yet in the previous phases, your consecutive NORMAL ATTACKS should kill the boss in one turn. In the next phase repeat the same thing butt renewing you and your party's buffs when they are about to run out. Repeat Until Boss is dead
Oh, word of advice, during the transition to each Phase, the boss's ATB bars reset so as long as you've reached the max ATB bar speed (somewhere between 1000-1500 in the Speed stat), you should have the first turn at the start of each phase since you are the protagonist and you and your allies get priority in the ATB queue.

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