This was a ridiculous fight, Baphomet talking a big game, then bulking up this guy who in round 1 gets hit with Ill Omen + Mortal Terror. 1st and a 2nd level spell and then a few hits gets him Shaken, then another Frightened. He then runs around his room a little pointlessly, then one more hit to render him Unconscious the rest of combat.

Mortal Terror is pretty ridiculous honestly, though you have to boost your Enchantment and general DC pretty high. I'm pulling out almost all the stops there and have a +39 for that 2nd level spell, against his +26 Will (on hard). So this little 'mini boss' would need to roll a 13, still better (for me) than flipping a coin.
I'm not sure how to exactly think about Ill Omen which is essentially a string of forced "disadvantage" rolls, but suffice it to say it tanks his chances pretty hard.

Also Arue, Daeran, and Woljif have absolutely destroyed his Str and Dex in a few rounds. Grandmaster Rod + Wracking Ray can be devastating.