[Lewdcifer]

I personally agree that Scarlet Twister and Bloody Spike could both go with a proper nerf. Twister has considerable synergy with other features such as cinders and frostbite ice sheets for the madmen. My opinion is as follows:

For Scarlet Twister, taking into account its HP cost, my suggestion is that we give it a brief cooldown (2 or 3 rounds) and maybe reduce the scaling by a little bit (from 115% Wind/Water ATK to somewhere between 90% and 100% Wind/Water ATK, all of this at rank 5); this way players will have to think more about when to use it.
For Bloody Spike, a reduction in scaling and maybe even range could suffice. Given that its HP cost is smaller than Twister, its scaling should be proportional to this difference: from 115% Ice/Water ATK, it could go between 80 to 90% Ice/Water ATK; all of this at rank 5. As for the range, perhaps capping it at some point could prevent players from assuming Grindylow status. I don't believe that this skill deserves a cooldown, and if anything, it shouldn't go beyond 1 round.

Like Snake said; these changes won't really harm Ghost much, given that it has several other things that are making it a strong class nowadays.