Necromancy CE has 50% chance to activate Guts and you can’t apply another guts while you equipped with this CE. I suggest you use another CE that give you guts 1 time+another servant that can apply guts to teammate so you can get total 3 guts (including Musashi guts), that should be enough to clear this challenge. This run I just do it for fun with Necromancy RNG.
My Musashi just dies at the end of the first turn, even following this video precisely and even if she has Guts.
Necromancy CE has 50% chance to activate Guts and you can’t apply another guts while you equipped with this CE. I suggest you use another CE that give you guts 1 time+another servant that can apply guts to teammate so you can get total 3 guts (including Musashi guts), that should be enough to clear this challenge.
This run I just do it for fun with Necromancy RNG.