FormerlyHemlock
Hero
The Balor seems especially feeble though especially if he cannot leverage his flight & reach and eyballing the DMG would make him more like CR 12 or 13 (still easy though)
Coming from AD&D, it looks to me as if all the 5E Baatezu and Tanar'ri are missing all their special abilities, and they have terrible weapon resistance now too. At minimum I think all the Baatezu need regeneration back--ultra-regeneration (unstoppable except via holy water) was kind of their thing IIRC, just as teleportation was the Tanar'ri's thing. And I'd also be liberal passing out the spell-like abilities like Alter Self and Hold Person.
In order to be appropriately scary, the Balor should, at minimum, have the tactical flexibility to grab a PC with his whip and teleport him somewhere for a nice one-on-one beat-down session. Fortunately, 5E's CR standards allow you to add arbitrary amounts of mobility to a monster without changing its CR, so you can just pencil "and Teleport" into the MM Balor's multiattack entry. Then flavor his teleportation with a wisp of smoke, and watch the beginning of X-Men 2 where Nightcrawler attacks the White House, and you're ready to go!
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