Minecraft Dungeons - All Bosses + Cutscenes (All DLC) Flames of Nether DLC Mini Boss Included - YouTube
Was playing a custom map provided by Mojang for free once you update in BE. This was the final boss. This is probably our closest to having an actual nether boss. :
Wither – Minecraft Wiki
Vote Pig Boss For Minecraft Nether Update - YouTube
Minecraft Nether boss ideas by omargabagu on DeviantArt
How to Build a Wither Boss in Minecraft
How to Build a Wither Boss in Minecraft
How to spawn and destroy the Wither boss in Minecraft - BrightChamps Blog
Challenging END GAME bosses in Minecraft! (Bosses of Mass Destruction Mod) - YouTube
Minecraft: Nether Boss Battle by AGpro1221 on DeviantArt