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Hot take: Strongest creatures in the setting shouldn't just be clowned by PCs with no resistance.
(ttrpg.network)
Inspired by frustrating conversation I had. For those curious, that was the statblock of Caine, father of the vampires.
DnD tends to be balanced between the levels of 5 through 12. Most modules sit in there.
But I'm not saying anything controversial when I note that 5e CR is a bad way to do encounters.