Conquering the main Easter Egg on Der Eisendrache in solo mode is one of the most satisfying achievements in Call of Duty: Black Ops 3 Zombies. While tackling "My Brother's Keeper" alone requires strict ammo management and precise map knowledge, game mechanics actually adjust to help single players. Most notably, playing in ranked solo mode allows you to complete the quest by upgrading only a single Wrath of the Ancients bow rather than all four.

Setting Up Your Solo Run Early

Efficiency in the opening rounds is critical for setting up a smooth solo playthrough on Griffin Castle. You should aim to turn on the power, feed all three dragon heads, and forge the base Wrath of the Ancients bow as early as possible. Building the Rocket Shield and acquiring key perks like Quick Revive and Juggernog will provide the baseline survivability needed for upcoming steps.

Upgrading a bow is your next priority, with the Lightning Bow (Storm Bow) generally offering the best crowd control for solo players. Collecting the Ragnarok DG-4 parts by defeating the Panzer Soldat and activating the Death Ray is another crucial step that must be done before proceeding. Having these essential tools ready ensures you can handle zombie rounds while focusing on complex puzzle triggers.

Navigating the Time Travel Steps

To initiate the main questline, shoot the teleporter prongs with your upgraded bow and travel back in time to retrieve necessary items. Inside the past realm, grab the soul canister and blue fuse while taking note of the safe combination shown on the wall. Returning to the present allows you to input this code at the Death Ray to unlock the safe near the clock tower.

After placing the fuses back into the Death Ray and switching it to protect mode, play a round of Simon Says on the computer terminals at both the Death Ray and Rocket Site. Successfully completing both terminal memory games spawns a crash site near the courtyard containing the keeper stone. Taking care during these sequences prevents unnecessary resets and keeps round numbers low.

Escorting the Keeper and Collecting Souls

Inserting the stone into the main tomb area summons the Keeper, who will then roam through four distinct locations around the fortress. As a solo player in ranked mode, every soul ring required by the Keeper will match the element of the single upgraded bow you built earlier. Stand inside the glowing circles and eliminate zombies using your bow until the Keeper moves to the next station.

If you play an unranked solo game, the game may require you to build additional elemental bows, so sticking to ranked solo matches is highly recommended. Keep a strong bullet weapon like the Haymaker 12 or KRM-263 handy to deal with Panzers that spawn during soul-filling steps. Once all four locations are complete, the Keeper will transform and open the pathway to the final arena.

Defeating the Keeper Boss Solo

The final boss fight against the corrupted Keeper takes place in the pyramid chamber and tests your mobility and damage output. Always place your Ragnarok DG-4 traps in the center of the room when the boss charges its wipeout attack to expose its glowing chest chest core. Unload high-damage weapons into the chest while continually running circles to avoid spawned skeletons and Panzers.

Repeating this trap-and-damage cycle three to four times will defeat the boss and return you to the main castle map. Finally, place the summoning key into the computer terminal in the control room to trigger the cinematic ending. Defeating this quest solo demands patience, but proper preparation makes the entire process manageable and highly rewarding.