One of the oldest beings in existence, he's the sole surviving ancient god from over 100,000 years ago. He's essentially unmatched in raw power—pretty much the strongest thing around. As the leader of the gods, he holds authority over the divine realm, though what that actually means depends heavily on which version of the mythology you're looking at.
The fact that he's outlasted literally everyone else from his era is kind of the whole point. Most fans fixate on how impossibly old he is and what that kind of lifespan would do to someone's perspective on, well, everything.
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