I have a 4 player party that will be level 7, intended level of this boss is 10. I have a fighter, gunslinger, magus, and monk.
I haven't been able to find a witch npc, so I created it using pc rules as the gmg suggests. He has an ac of 28 and 118 hp.
Does this seem too low? My fighter could crit and potentially take him halfway down in one hit.
Also, does anything on the spell list or feats/actions seem too strong?
If want a deadly encounter you might want to consider an Extreme (party level + 4) encounter instead of a Severe (party level + 3) one.
In any case, a Moon Hag (level 10) might be what you want, or you can use it for comparison with the one you created.
I missed that I only had that as a severe encounter, thanks for the spot.
And yeah, I just spent some time looking at the moon hag and saw that I will need to buff some numbers on this guy.