Dungeons 3

To obtain this achievement you must not let the dungeonheart's hit points drop below 5000.

To begin with there is a death hammer Grimli will use to cause tremors through your dungeon which will damage the dungeonheart for about 1000 points. You also have to worry about heroes entering your dungeon through the front door. To deal with those I built a series of spike traps along my main corridor with a door at the end to slow them down. So one of your first tasks is to get box production set up.

When attacking above ground I made sure I left 2 orcs to mop up any heroes that hadn't been killed by the traps.

Destroying the first hammer quickly isn't too important as your dungeonheart will regenerate hit points over time if damaged. Build an army of around 9 orcs and 4 nags, along with any zombies and demons you have. Send them at the hammer to destroy it. After you destroy the first hammer a second will appear which isn't much of a threat. You will need to create a bridge but it's all scripted and the game highlights where you have to go.

The third hammer is a pain. It's actually 3 hammers, which can deal big damage to your dungeonheart. These hammers hit me twice before I could destroy them, doing 2000+ and then 2500+ damage respectively, so make sure you're at full health and deal with raiders quickly. I would recommend taking them down before the 3rd strike to be sure of them not dealing too much damage. Build the biggest army you can and prepare to send reinforcements.

On approach to the hammers you will face a cannon turret. I would say that you should take it down before reaching the gate, else it will pummel your army whist trying to take down the gate.

When dealing with groups of enemies, target any novices/apprentices first, then any dwarf cannons, then the dwarves, then whatever is left.

The achievement will pop once you have defeated Grimli, along with the achievement for completing the mission if you haven't popped that yet.