Nothing in vanilla aside from repeatedly hitting and creative mode can break obsidian. No amount of wither or TNT will break it.
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The Only thing That Can Break Obsidian Is A Diamond Pickaxe. :3
You may only mine Obsidian with a Diamond Pickaxe.
No. Only a Diamond Pickaxe can mine obsidian.
No you can't you can only mine the obsidian with a diamond pickaxe.
No, you need a diamond pickaxe to mine obsidian.