Description of feature
Describe what you want in the mod. Make sure this was not already suggested. List of commonly suggested features: #217

ONLY ONE FEATURE REQUEST PER ISSUE

I think that when the wither storm's health should increase each phase instantly, for instance if phase n's health is x and phase n+1's health is y, the health would increase by y-x instantly.

#531. Not exactly the same, however similar enough.