Let's Read The Immortal Handbook Bestiary

[Arcanist]

I would largely agree with that assessment.

Like I said, I think he'd be killed by a party of level 20 of lower tier characters.

I think I'm starting to pick up on a theme here: A lot of these so-called "Godlike" entities can very easily be slaughtered by a party of moderately optimized sub-epic (which this book defines as 20 and under) adventurers that know what they are doing OR even worse by one moderately optimized low epic (below 24 I think?) adventurer.

He just doesn't stand out as a threat. Maybe I'd use him as a story arc capstone villain of the week, but probably not make him the BBEG he wants to be.