Suggestion: add a means of destroying the wither storm ONLY in its lower phases (Eg, 1 2 3) maybe the command sword would be able to damage the wither storm more [when the command block is visible] or add the elixir from mcsm(Minecraft story mode) in order to kill it. [and get a command block] (while the command block is visible)

While this isn't the same "item," the idea is the same and was closed for reasons explained here: #65

Okay