Locate the Statue of the Mother Goddess - part 2 Overlord Guide

Outside the mines - turn right and you'll come to more barriers (#1). Break them and you'll see a dwarf with a fire blaster! Now watch out as you might get killed in a second. One way is to leave minions out there (Q) and sneak to the dwarf - avoiding the fire - and attack him from the back. As he gets weak he'll throw flames all around so better move away before he explodes (you can use fireball from distance to make sure he's down). Not far behind the place there's a huge door and some mines (bombs) next to it (these spiked metal things) (#2). Now, leave your minions away and send one to grab a mine and carry it to the door - and call him back right away. Use one more (it'll appear in the same place) to break the door. Now it's open - let's go in!

Follow the path left - it will lead you to the waypoint and spawning pits and another door - to your right (#1). You break and open it the same way as the other just now you need 4 mines. Some dwarven guards will notice you as you approach the door and they'll start throwing mines at you - use them to break the door! When a dwarf throws a bomb send a minion to grab it and leave it by the door. Repeat it 4 times to open the door and... say hello to another armed dwarf (#1). Kill him and the little fellows that follow him.

Break all the barrels and take right and the stairs up (#1). Go up to the wooden platform and follow around it killing more and more dwarves in the way. You'll find another tower object here (#2) - it's health increase. Carry it to the waypoint (and replenish your minions).