New mode and levels, with traps and gear to use at your own pleaure in killing hordes of invaders, plus a new awesome weapon, Dwarven Missile Launcher which you will probably love, you shouldn't miss out on this dlc.

The inclusion of the "Dwarven Missle Launcher" and "Spike Wall" is worth the price of admission alone for this DLC "booster pack."

One provides a "flak" shot for flying enemies (practically a must if you want an even slightly reasonable skull rating on the very last mission without pulling your hair out), and the other gives an invaluable push-back for maps like "Passages," "Corridors," and any endless map.

This booster pack is great. The new maps have a very fresh* feeling, compared to the vanilla game and the other DLCs. The new enemies give you a whole new challenge. But my personal highlight is the "Dwarven Missile Launcher". What an amazing weapon: Blow up enemies or use it as a flak to shoot down fliers!

)* not only because of the ice levels :D