Awakening of Evil

I recently downloaded a campaign. In the first mission, where there's the "Cloak of Deadly Shadows," and in one of the circles where undead appear among the neutral creatures, there are creatures that look like Cave Lords, but there are 750 of them, and each has 10,000 health, and darkness doesn't affect them. How do I fight them? Also, instead of wolves appearing when exiting the dungeon, there are dark, thick men who attack from underground at a distance. They also appear in other places. What's the best tactic against them?