Regarding Demogorgon, in mid-December I boldly tweeted:
True story, though: I was wrong. I still don’t get how to run Demogorgon, the Prince of Demons, the Sibilant Beast, and Master of the Spiraling Depths (MtF, p.144). The crux of my problem is this: nobody wants to look at him, and if they don’t, his most potent weapon is useless. On top of that, the rest of his weapons aren’t all that good either.
According to encounter creation rules, Demogorgon is a beyond deadly encounter for 4 level 20 characters . In my experience, this fiend performs way below expectation, and possibly the least threatening of the Demon Lords. Here’s where the problem lies:
As Willy Wonka would say, “It’s all there, black and white, clear as crystal!” The PCs can just look away. The fiend gets to use the gaze twice as a legendary action (only twice! on a CR 26 monster! yeesh!). For one glorious combat I misread the rule and though I could ignore the part about looking away, and just confuse and stun players at will. Yeah…but nope.
You might say, “But, Voivode, when they look away they have disadvantage on attacks, and grant advantage when attacked!” I’d agree that’s true, but how many level 20 PCs don’t have some relatively easy way to invoke advantage and making it a wash? Very few. It’s AC is 22, which is pretty good, but still relatively beatable. The +17 attack mod helps too, but combined with a decent-but-not-great 406 HP, it’s all just not enough. By comparison, a tarrasque at CR 25 has more HP, more resistances, a higher AC, and 3 (count ’em 3) legendary action that the PC can’t just choose to ignore.
Honestly, this naughty boy would go on my Blocklist if he weren’t so much drama. The best I can recommend when you’re building an encounter is to make sure it happens in his lair. He might as well have few extra trick (and they are only tricks) from his lair actions and that way, when he gets his ass kicked, he can sleep it off in his own bed.