You're all forgetting about the Evil Eye! After all, they formed the backbone of my army (just like harpies!):smile23:
Added 7 minutes later
The race is decent, it's normal. Only many of the monster buildings require valuable resources, and sometimes there's a shortage of them. Also, a level 2 Mage Guild is needed for Dragons, and a level 3 for Black Dragons. Mana Vortex is great (I've never seen the AI build it), and the Summoning Portal also helps with extra warriors.
Regarding tactics... I almost never play as the Dungeon, but having 2.5 ranged units (0.5 - harpies), I usually stick to a defensive tactic in battle. And the castles are easy to storm, with only 2 infantry, the rest are ranged and flying units.