This guide is for the trophy Taking Flight, which requires you to ride the dragon in the map Gorod Krovi.
In order to do this you must build the dragon control module by assembling 3 parts contained within Groph Capsules.
Whilst killing zombies, they will occasionally drop a cylinder, it will either be red, blue or yellow. The colour of the cylinder is dependent on which Groph computer you will use.
Red Computer - Tank Factory area, right in front of the fallen robot.
Blue Computer - In the Dragon command building, the building with S.O.P.H.I.A.
Yellow Computer - In the Supply Depot
When you place the cylinder in the computer it will cause a Groph Capsule to fall from the sky to a location on the map, the location can be found by the bright green light in the sky, similar to the Mystery Box's location.
Run to the capsule and defend it. Zombies will still attack you if you come close to them, but they seem to primarily focus their efforts on the capsule.
When you have defended it long enough, the capsule will kill all the zombies in the area and you can collect the part for the Dragon Control Module.
Note: If you do not protect the Groph Capsule, the zombies will destroy it and it will explode, causing you to find another capsule and repeat that step again. The light of the capsule will change from green, to yellow, to red to indicate its health Once you have done this, head to the Operations bunker (where you build the shield) and there will be a computer terminal you can install your 3 assembled pieces. Once all 3 are placed in the machine you can now fly on a dragon.
Go back to the dragon command building, or the tank factory and hold
to pay the 500 points to ride the dragon. After a few moments the dragon will land, and you can ride it by holding
again.
By the time the cinematic ends your trophy should pop.