Not for me.
Then again, as said... no farming.
Starting on Flying Fortresses, and damn, they are hard on Nightmare.
Not warriors, my mage eats them for breakfest.
Not mages, there projectiles are easy to evade. Although they use Rush Attack (wth?) which can be painful.
Nope, it's those darn rangers with their homing missiles that do my hit point bar -30 per successful hit.
Especially when combined with that undefendable magic attack that stuns you for a short duration, although all magic becomes dangerous then. Darn spell.
Oh well... guess that's what I get for highest difficulty...