>>536419837
you're kinda fucked but you can probably use a different sinner for it
the basic idea of speedrunning MDI with Fell Bullet is starting with GuboSang, an ID with a wrath defense, and a low level sinner (perfect sinner would be one with low enough HP to get killed from Fell Bullet without crit RNG, has a wrath defense (from most optimal to worse: Defense > Evade > Counter), and a wrath S1 (or at least S2))
you're gonna prioritize event nodes over any other, so your run is faster
you're gonna pick Star of the Beginning, and Interstellar Travel. pick the Poise E.G.O.s and get Stone Tomb. for your E.G.O. gifts pick Grand Welcome and Sharp Needle
the first floors will be the toughest if your IDs are too high leveled, at least until you get CMCW, and the Poise and Bleed rocks
you're gonna lead with your wrath defense ID, then your sacrifice, and lastly GuboSang. why? in case you corrode, so you lose less resources. then you're gonna defend with everyone (this will net you 2 wrath and 1 pride resources, which will be enough to fuel the E.G.O.), then second turn you're gonna use Fell Bullet and kill the sacrifice (since you killed the sinner, it's gonna give you resources corresponding to their S1 and S2)
here's a more indepth guide (if you can't stand the accent or whatever, just check the doc in the description)
https://www.youtube.com/watch?v=I33njZ9ClyQ