| I think it looks pretty fair, even if he's a level 3 blighter (although to be on the safe side, you might give him only two levels of the PRC.) That makes him CR 8, versus a 4th level party. A very hard fight, which they will win or lose about 50/50. That is fair, strictly speaking.
Just make sure that the dungeon contains healing potions, pearls of power, etc. so the party can fight this guy with their resources replenished, instead of being totally depleted when they make it to him. Alternately, contrive some opportunity for them to rest before they fight him. Otherwise, they're likely to get torn apart.
And keep in mind that his spell selection probably won't be focused on killing this particular party, he was probably expecting to do something else that day. Make a general spell list, not a 100% combat-optimised one, is what I'm saying.
Edit: Just looked up the Blighter for a second opinion. Definitely, make him a 3rd level blighter, since the druid levels will give virtually 0 benefit to him. Also, give him a good spell list -with that few spells per day, he can't afford to waste any, or he might as well be a 6th level ranger instead of the build you have.
Last edited by Asha'man; 6th September 2009 at 09:47 AM..
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