First thing I summon Lostvayne & Book of the end. As I make my way to my first obstacle Shalltear I have my 6 copies cut the ground with book of the end as we make our way.
Using petty insults of Ainz to get Shalltear to start the battle as fast as possible. She takes out the decoy in her first strike, using this time one of my other clones go in with Book of the end, she easily sees the attack coming. Though It doesn't matter as she's struck, not understanding what happened she notices me in the corner of her eye with Sakanade. At this point, she must have realized that it was having an effect on her senses, seeing as how it had Inverted them. But soon she'll forget that, with the Book of the end I can give Shalltear a past where I replace Ainz, and I can even rewrite her memories of everyone. With my new ally I make my way further into Nazarick. Once I make it to Gargantua I summon the gravitational beam emitter and take out what would normally be a tough opponent.
My next opponent Cocytus, I'd have Shalltear keep him busy while I summon the weapons I'll need for the coming fights. Seeing the fight unfold I use my Book of the end on the ground and signal to Shalltear to move him to that spot. Once done the trap set with my Book of the end binds him in stasis, allowing me to add another to my stolen subordinates. Having Aura & Mare as opponents is a tall task so I leave it to Shalltear and Cocytus to fight them for me waiting for an opening to take em. Next is Demiurge instead of letting this draw out I amp Shalltear's stats through her weapon, then have her weaken him.
8th floor knowing this is said to be tough I figure I'd use my new subordinates amped with my weaponry. Even with the amped stats from my weapons this floor is especially difficult. After floor 8 we've made it to Albedo & Ainz and I can tell he's taken aback, and because of this I tell my stolen subordinates to stand back. I use this as a chance to offer to fight Albedo and give Ainz a chance to come up with a plan. This fight goes as well as it can with me using all the other floor guardian's weapons, but it ends the same with me using Book of the end.
At this point Ainz bluffs saying that he'll give up, its at this point it's revealed that he was able to undo my Book of the end by editing the NPC's. Ainz takes this time to monologue, I reveal to Ainz that I still have my trump card taking out my sword he stops time. With that he kills me, siting back down on his throne his NPC's take their positions as a beam bisects Ainz. It turns out I figured he could undo my Book of the end and that I'd likely be at the mercy of his time magic, so I needed to know exactly where he would be. Using the Power Sword I was able to make clones with relevant strength when also using Lostvayne. Since I knew Ainz would go to his throne after defeating me, all that was left to do was aim Excalibur imbued with the Power Swords might and I'd win.
Seems good enough ¯\_(ツ)_/¯