[Senna]

We have two (I think) that's 50/50 scaling but they're decent in THAT art. Example, one has a chance to summon a twister (If someone even gets it off, that's just unfortunate for the victim), the other gives bonus damage on hidden cut and has like 125 crit mod. The only other weapon currently aside from Sogen with 120% scaling is Dual Blade yet no-one really uses that because the 'power' scaling isn't that impressive.

Suggestion: If it's going with the 50/50 scaling, I'd suggest removing the on-hit and 'buff' or 'add an effect'. The previous suggested frostbite sounds decent and can work well with it's skill since it does make Ice tiles. You can even add another star on it and make it similar to Tarnada with a UL% chance to cast XYZ if you choose to take it that route. It'd give the weapon it's own identity after the nerf so people don't simply use the other REALLY good Katanas like Raijin and throw the Sogen in the trash. (It's already happening)

Suggestion #2: Keep the 120% scaling but lower the base power by like half instead. Just a simpler suggestion. It won't be that godly without making massive sacrifices but that'll also cause the weapon to depend on classes like Hexer to even be useful.

Though it needs to be it's own thing and not just a "That one cousin of the Jin weapons that wanted to be cool but failed". It needs a reason to be a level nine star Katana. So if its gonna catch that L, add the power somewhere else on the weapon to make up for it.