It’s technically not required if you get insanely lucky RNG. We’re talking RNG that would happen 1 in 100 fights (not an exact number, but it’s honestly probably pretty close to that). That said, it’s just not worth the risk. With the diamond armor Alis becomes somewhat of a tank and makes the boss much more manageable. You will celebrate when she gets hit for 20 instead of Noah getting hit for 80.