How to Do the Der Eisendrache Easter Egg From Start to Finish

The Der Eisendrache map in Call of Duty: Black Ops 3 remains one of the most celebrated experiences in the history of Zombies mode. Navigating this snowy Austrian castle requires players to solve complex puzzles, upgrade powerful elemental weapons, and defeat a formidable boss. Mastering this multi-stage quest demands precise execution, careful point management, and deep map knowledge from start to finish.

Power Activation and Dragon Feeding

Before any major quest steps can begin, survivors must navigate the castle corridors to activate the main power switch. Turning on the power unlocks vital areas of the station and enables the use of the dynamic traps and buildable tables. Once the power flows through the facility, players must locate and feed the three stone dragon heads mounted on the walls.

Slaying zombies directly beneath these ancient monuments causes the stone beasts to consume the fallen foes. Feeding all three dragons rewards your team with the Wrath of the Ancients, a powerful base mystical bow. This weapon serves as the mechanical foundation for all subsequent upgrading steps required to progress the main storyline.

Building the Upgraded Elemental Bows

To advance deep into the castle secrets, players must transform the basic bow into unique elemental upgrades known as the Lightning, Wolf, Void, and Fire variants. If you are playing a ranked game solo, you will only need to complete a single upgrade path to proceed. However, unranked or multi-player sessions will automatically require your squad to finish all four distinct weapon quests.

Each upgrade path challenges players with unique targeting puzzles scattered across the courtyard and lower laboratories. Completing these challenges allows players to imbue their arrows with devastating area-of-effect capabilities. These weapons are absolutely essential for surviving the high-intensity lockdown rounds and protecting your teammates from aggressive enemy waves.

Time Travel and Wisp Hunting

With the upgraded bows secured, players must use the Ragnarok DG-4 spikes to trigger a specialized tracking phase across the map. Your team must hunt down glowing electrical wisps that spawn randomly inside interactive objects like clocks and radios. Shooting these hidden anomalies with an upgraded bow triggers a temporal distortion that teleports players back to the historical group 935 laboratory.

During this brief trip through time, survivors must memorize a code combination and collect crucial quest components hidden around the room. Returning to the present allows players to input the code into a terminal to change the security systems. This process safely lowers a massive defense rocket containing a vital golden artifact needed for the final ritual chamber.

The Keeper Ritual and Boss Fight Preparation

The final pre-boss step requires players to escort a ghostly Keeper entity across multiple tactical locations on the map. To fill the ancient stone tablet, players must stand inside the circular aura and defeat zombies using the specific bow element indicated by the screen border color. Once the artifact charges completely, the central teleporter pad activates to grant access to the grand boss arena.

Before stepping through the portal, players must fully replenish their armor, maximize their ammunition pools, and equip high-tier defensive perks. The upcoming battle pits your squad against the corrupted Keeper spirit in a multi-phase survival gauntlet. Defeating this entity involves placing the Ragnarok spikes beneath the central core while shooting the exposed weak points to permanently end the ancient threat.