Would be cool if you could set specific RNG seeds, maybe freeze them?

[toimine]

There are some attacks that only have angle RNG (like Eirin's 4th spell, Shou's 3rd or Byakuren's 1st, Doremy's 1st non, etc.), or attacks that get noticeably different due to boss movement RNG (like Clownpiece's nons, etc.), and letting the player practice specific variants of those would help learning them a lot