Tunguska: Slaughterhouse is a wave defense/survival mode set in a new location in the Zone.

This final DLC puts everything you have learned to the test. Teleport into a Soviet administrative headquarters and stop the waves of enemies from energizing Valentin, the dark disciple of Lord Kraiken who wants to claim the Zone. Pick up Soul Stones left by your fallen foes and trade them for weapons, gears, and supplies. Use your creativity with all the tools available in the game (and more) to outgun a seemingly undefeatable enemy.

- Endless waves of enemies that will end either with player's defeat or Valentin's defeat, depending on the level of his power reservoir.

- Four bosses who once defeated will leave player weapons and gears completely new to the game, including:

= XM177 carbine
= M249 SAW
= PKM
= RG6 grenade launcher
= Armor plating and padding insertion
= Heavy armor locomotion unit
= Casing caliber converter
= Klemens' Folly, a magical helmet
= Valentin's Hood, another magical helmet
= Valentin's Finger that can be used to craft Distortion summoners

- All these weapons and equipment will become available at the traders in the *Main Game* once you unlock them in Slaughterhouse!

- Access to all the weapons, armors, serums, and gears in the game while fighting in the Slaughterhouse.

- Special throwable items that can summon different types of Distortions against enemies.

- Charged Soul Stones that can summon a human soldier to fight for you.

- A special tool used to charge a soul stone from a human.