Get either Francesco's or Oscuro's mod. It will up the challenge big time, though Francesco's is a little more balanced. No going up against 20th level necromancers at 1st level unlike OOO.
Man, I had to use the environment to kill that necromancer in the first ruins in order to win.
With Francesco's mod I faced mages you would actually run back away from melee, summon critters, then used range attacks on me while fighter types and their summons charged in. They were using actual tactics. Of corse I blasted them with a few choice lightning spells. One mage was trying to run and jump across a broken bridge to get away from me but I pegged him right and the back and killed him.