The iconic Call of Duty Zombies map, Der Eisendrache, remains a fan-favorite experience for players seeking a perfect blend of high-stakes survival and intricate storytelling. Titled My Brother's Keeper, the main narrative quest requires players to solve hidden puzzles, upgrade ancient weapons, and survive a brutal boss fight within a snowy Austrian fortress. Mastering the operational steps of this undead gauntlet is essential for anyone wishing to complete the overarching timeline quest successfully.
Building and Upgrading the Elemental Bows
Before diving into the complex steps of the main quest, your squad must unlock the Wrath of the Ancients compound weapon system. This initial phase involves feeding three stone dragon heads located across the castle walls with standard zombie souls. Once the base weapon is secured, players need to initiate specific upgrade paths to transform their arrows into powerful elemental variants.
While completing the challenge solo only requires upgrading a single weapon, a full cooperative team must forge all four legendary variants. Surviving late rounds becomes significantly easier once you have deployed the localized storm or void traps against aggressive hordes. Managing these elemental assets early in the game ensures your team is prepared for the escalating challenges ahead.
Initiating the Wisp Sequence and Time Travel
The true quest begins once players construct the standard Ragnarok DG-4 specialist device and secure a regular bow to trigger the teleporter prongs. After activating the core electrical nodes, a hidden audio cue indicates that electrical wisps have spawned at random locations around the map. Players must move quickly to locate and shoot these energy clusters before the round timer expires.
Successfully chasing down the glowing nodes allows the squad to utilize the primary teleporter to jump backward through the temporal rift. During this flashback sequence, players must closely observe the doctor as he inputs a safe combination and interacts with artifact containers. Grabbing the ancient stone slab and the blue fuse during this window provides the essential quest items needed for the upcoming tower defense sequences.
Charging the Keeper Companion and Protecting the Realm
Returning to the present era allows you to place the recovered electronic components directly into the death ray fortification system to alter its operational mode. Launching another time travel sequence is required to input codes into the laboratory computer terminal and extract the summoning key artifact. Successfully managing these inputs triggers the physical arrival of the ancient Keeper spirit in the center courtyard.
Players must now escort the ghostly entity as it travels to four distinct ritual circles scattered across the castle grounds. Standing inside these glowing boundaries charges the spirit using weapons that match the specific elemental aura displayed on your screen. Complete coordination is required during this step to prevent the group from being overwhelmed by heavy Panzer soldat units.
Surviving the Apex Boss Encounter
The final trial takes place within a massive enclosed arena where players face off against a corrupted version of the ancient Keeper. Team members must place their specialist traps concurrently in the center ring to expose the weak core of the massive entity. Unleashing concentrated firepower into the glowing chest cavity is the only way to diminish its large health pool.
Between damage phases, the arena will fill with skeletal minions, electric shockwaves, and aggressive armored shock troops that require constant movement to avoid. Successfully executing this cycle three times conquers the threat and unlocks the final dramatic cinematic sequence. Reaching this conclusion provides closure to one of the most mechanically diverse map adventures in history.