If you're including gods/deities, Lord Ao is the big guy. Besides them, the most powerful single creature is the Tarrasque. I have also heard something about a Mithril Golem, but the Tarrasque is known almost everywhere as D&D's most powerful creature.
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When layer lies upon layer, webs of deception are spun inside one another, and you can no longer distinguish fact from fiction, reality is what you make of it.
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