What's the deal with Minecraft: Story Mode's Wither Storm?

Almost everything in Minecraft: Story Mode exists in vanilla Minecraft or resource packs - except the Wither Storm.

Wither Storm, Minecraft Story Mode Wiki

Chapter 5 - Episode 4 - Minecraft: Story Mode - A Telltale Games

Our Minecraft Story Mode Review for Nintendo Switch

MINECRAFT STORY MODE) Wither Storm At Nightmares Times.

Wither Storm* plot from Minecraft: Story Mode Minecraft Map

I made the Wither Storm from Minecraft Story Mode using commands

Minecraft: Story Mode Season Two - Episode 5: Above and Beyond

Steam Workshop::Minecraft Story Mode: Wither Storm Pack

Wither Storm APK for Android Download

Minecraft: Story Mode – Episode 4: A Block and a Hard Place Review

if only the wither storm had deeper lore instead of just wither

minecraft story mode:wither storm by Bandicool on DeviantArt

Minecraft: Story Mode - Episode 4: A Block and a Hard Place

Minecraft: Story Mode Episode 6 “A Portal to Mystery” review

Minecraft: Story Mode Wither Storm Theme: OST - video Dailymotion