The Wither Storm Add-on spawns the wither boss into a large and frightening boss known in Minecraft Story Mode as the Wither Storm. It has 6 stages you can kill it if you are strong and clever enough. It's like 20 times larger than the wither boss and also much more powerful. It's the ultimate challenge for anyone considering themselves a good fighter and want to find out how far their skills can take them. Fight him If you have the guts to survive!
Disclaimer: This is an unofficial application for Minecraft Pocket Edition. This application is not associated in any way with Mojang AB.