In order to activate the event, The Player must find 3 teleporter coils, which are at the following locations:
- One teleporter coil can be found inside the underwater entrance of the sewers (from the river) beneath Berlin.
- Another teleporter coil can be found inside the crashed space shuttle located in Cologne.
- The other teleporter coil can be found inside the crashed train in the top-right corner of the map, near the Ostsee Compound.
To advance, the coils must be brought (either separately or together) to the teleporter in a secret laboratory in the aforementioned sewers.
After all the springs are placed The Player can stand inside the teleporter and activate the machine to teleport inside Neuschwanstein Castle. However, the actual location of this area is inside a mountain outwith the map.
When The Player reaches the castle, they need to defeat a Kaiser Zombie Boss in order to gain the achievement.
The Zweihander can be found inside the big room to the right of where you teleport in. It is attached to the rack above the fireplace, near the feast table. The boss does not have to be killed to collect it.