Call of Duty: Black Ops 3 Zombies (DLC #3 Descent) - Not One Inch Trophy / Achievement Guide - In Gorod Krovi, complete a Lockdown Event. [Bronze]

First you must ride a dragon to the pack-a-punch machine. If you don't already know how to do that, use the video guide above. In the pack-a-punch area there's a crystal. Interacting with it will trigger a lockdown event. Here you must defend yourself from multiple waves of enemies. You will face normal zombies, lots of robots and drones.
Make sure you come very very well prepared. You cannot buy any ammo or perks here (even the pack-a-punch will be unavailable during lockdown)! The fight lasts for about 4 rounds and the enemies here don't give you money. I highly recommend the GKZ-45 Mk3 from the mystery box. With it you can camp on the upper floor and create black holes that will suck in the enemies. The upper floor is the best place to camp because enemies can only come from one direction.
Ammo preservation is very important here. Also bring at least 5000 points so you can use the Pack-a-Punch before interacting with the crystal. When all enemies are dead the lockdown will end. Now you can pick up the Dragon Strike Controller from the Crystal (which you will need for the "Fire MissioN" trophy).

The Fafnir Shield will also be useful for extra protection

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