Minecraft one command block- Wither Storm boss battle 1.8.9 (From Minecraft Story Mode)

Submit ideas for one command creations: \r
Wither storm boss battle in just one command!\r
Command and resource pack: \r
Barf heads channel: \r
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CREDIT\r
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Command made with MrGarrettos command combiner: \r
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Textcraft: \r
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Music: \r
Firefly by Jim Yosef [NCS Release]: \r
Wither Storm theme song: \r
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MY LINKS\r
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Twitter: \r
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A huge shoutout to the best person in the world, James Stanton Margulis Jr.