I done this one on fighter.
All mobs have cr54++ and have a very high Armor Class (2+60 is often a grazing hit), resulting in longer times to kill them melee-wise.
All mobs seems to have a good fortitude save because my stunning attempts 58DC i think landed slightly less than 50% of the time, probably it was a problem of to hit as well not only DC.
Mobs hit 114PRR character for 130-150 damage per hit. I've seen some sneak attacks with 100% fort.
Overall mobs looks like sturdier than eeHigh Road Quests but seems to have lower damage output. Furthermore they are hobgoblins: some of their animations are very funny and they jump in and out sometimes making them attack less times than mobs in eeRoad quests.
Bosses have a lot of hitpoints. The main boss is CR60 and has some nasty armor class.
Overall there aren't many change from the non epic version, but it has been a fun quest. For sure not one to be undertaken, else you die easly.
Ah and there's a red allert for all silver flame pots users. There's a diesease that gives you -10 wisdom, quite nice if you tend to use silver flames because it might make you helpless. I failed this disease at least 4-5 times during the quest and i had to retreat and heal.