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The Nikolai Mech is the final boss enemy in the map Gorod Krovi. The mech hosts Ultimis Nikolai inside who is the controller of the mech while being drunk.
Defeating the Nikolai Mech can be very challenging without gobblegum, but even with Classic Gobblegum, you can easily defeat the Nikolai Mech.
Gobblegum like 
In Plain Sight and 
Idle Eyes can be extremely helpful since they both make you temporarily
undetectable by the Nikolai Mech, allowing you to easily take out its weak points, which are the initial four Power Cores and then the final center core that becomes exposed once
the other four are destroyed.
The RayGun MKIII is extremely effective and should be the weapon you take into the boss fight, as it will destroy the power cores quickly, allowing you to defeat the Nikolai Mech
before the expiration of your In Plain Sight or Idle Eyes. You can read our full, detailed boss fight guide for the
Gorod Krovi main quest for more information on how to encounter and defeat the final boss.
The Dragon is the first boss appearing on the map Gorod Krovi. This enemy appears as main dragon seen throughout the map breathing fire down on the battlefield.
Furies are a special enemy originating from the map Revelations in Black Ops 3. These enemies are unique in appearance while having similar behavior to the Insanity Elementals.