Fatty's guerilla isn't what I'd consider 'legend plus' hard, honestly.
Try this:
Horus/Athena/Izanagi/Valkyrie/idk some water user, your chibiluci would be fine
Fatty's guerilla is 5 floors long-- 2 Kings, then 2 Super Kings, 2 Kings again, 2 Super Kings, Fatty. You can stall literally forever on kings, they're really not a threat. Just set up your board for the super kings and crush them. Have as many actives up as you can-- you're going to want Valk/Athena/Izanagi at the least, but Horus too if you're not confident in being able to make a full 5-color combo.
Horus' base multiplier of 16x for 4 colors plus a 2.25x boost on a turn when an active is used (which you will) is a solid 36x multiplier. With Izanagi's, you're looking at 72x Match 5 colors, that multiplier becomes 20.25x base -> 45.5625x with skill use ->
91.125x with Izanagi's enhance. With Athena's double TPA and light enhance active, you're looking at even more than double that. She's gonna kill him in one shot. Easily.
Fatty gives you 5 or 6 turns (I don't remember if he just straight up kills you on turn 6 or 7), and he'll deal 8800 damage per turn. So you can survive a hit or two without healing, but his attacks will fuck up your board. So you're gonna kill him on turn one!
Hopefully you've got all five colors on the board, but four will seriously be fine. Pop Valkyrie to maximize your light orb count, Athena to enhance them, Izanagi to double everyone's damage (but Athena's is really the only one that matters). You should already have 2.5 extra seconds to match everything since Chibiluci's there, but you can pop Horus too if you want an extra second. Focus on light TPAs and match all colors. With that kind of multiplier I'd be amazed if the damage doesn't absolutely decimate him.
Have more confidence in your leaders! (Especially ones with stupid good multipliers like Horus.
)
Or you could just run Meimei, pop a 7 star, GZL, and Athena and just no-sell him with light/wood TPAs. That's what I do. :V
