I don't have any creative or interesting ideas for boss mobs but there is one key function to have to make sure that they aren't too easy. The boss needs to be able to either fly or teleport. This is because it would be incredibly easy to cage where the player could mine a one block hole and be able to attack the mob without being hit. I see this happening on a lot of mods and mod packs out there and it will the purpose of a boss.
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