Blood of the Dead — Black Ops 4 Zombies Easter Egg Guide

Flip the West switch in the Power House (near the Brew/Bratwurst area), then cross to Building 64 on the Docks for East power. Two of Building 64's three levers are already thrown — flip the remaining one. The East switch spawns the first Warden (Brutus); kill him and take the Warden's Key he drops (needed for the shield build and several unlocks).

Route tip: cross the Catwalk early while enemy health is still low — the first catwalk crossing into the prison can itself spawn the first Warden, so whichever comes first (East power or the crossing) drops the Warden's Key. Then double back to collect shield parts and feed hellhounds so you are not backtracking later.

Gather three parts, then build at any shield bench — Transverse Tunnel, Cell Block 3rd Floor, or the Docks. Charge it by killing zombies with the shield key melee: 3 souls = 1 spirit blast, and the base shield stores 2. Hitting a sparking power box gives one free refill per round. Then aim a spirit blast at the voltmeter on the Roof to open the mobile Pack-a-Punch — after that it rotates between Roof, Power House and Building 64.

Attuned Spectral Shield (core finale prep): roll the Mystery Box until the Lock appears in it, shock the Lock with the Warden's Key until it glows blue-white, then throw Hell's Retriever at it. In co-op, every Retriever-holder who throws at the same moment all receive the upgrade.

• Spirit essence — randomised between the Library, Times Square, or the Michigan Avenue pool. Search all three; it glows in shield vision.
• Door / frame — randomised between the Citadel Tunnels or China Alley.
• Warden's Key — dropped by the first Warden after East power (Step 1); one is enough to build.

Find the three mounted hellhound heads and get close kills in front of each until it disappears (roughly six per head). With all three fed, use fast travel from the Showers or Warden's House and grab the floating Hell's Retriever as you pass through the lava tunnel. It is a returning one-hit tomahawk with no ammo cost — and the tool you will throw at the Kronorium later.

Tip: the third head is in the Cafeteria/Infirmary wing; feed heads on the same loop you use to collect shield parts.

In the Warden's Office, use shield vision to read the three shield-visible numbers (near-to-far order — this is a per-match code). Spirit-blast the Citadel keypad and enter them. Then spirit-blast the Docks voltmeter, wait for the crane net to stop swinging, throw Hell's Retriever at the net, and take the Spoon from the arm that drops.

Solo vs co-op: identical solo; in co-op one player reads the numbers while another covers the keypad. The Spoon can be upgraded to the Golden Spork (see side EEs) but the plain Spoon is all the quest requires.

In the Warden's House, melee the wall left of the Titan wall-buy at the top of the stairs with the Spoon — a visible scratch confirms the right panel. Now spawn a Warden: enter 666 on the Citadel keypad for the once-per-match Warden, or wait for a natural round-18+ electric Warden. Throw a Monkey Bomb directly beneath the scratched wall and move away so the Warden targets the decoy and ground-slams the wall — ordinary melee and gunfire will not open it. Inside, flip the switch beside the electric chair, take the red stone from the table, and place it on the wall map in Richtofen's Laboratory.

Tip: if the Warden dies before slamming the wall, spawn another on a later round (natural Wardens keep coming). Monkey Bombs make the slam position far more reliable than baiting by body-blocking.

Interact with the Kronorium on the laboratory floor; a seagull steals it and lands on a shield-visible perch. Aim through the Spectral Shield, listen for squawking, and spirit-blast the bird once per round. It only moves after a valid blast cue — do not end a round until it vanishes. Repeat on the next two rounds. On the fourth round a crying man is added to the audio and the perch shows as a pulsing white light: spirit-blast the keypad, enter 872 for Zombie Blood, then at the white light peek through the shield only until the book renders, lower the shield, and throw Hell's Retriever at it to drop the Kronorium at your feet.

• Sweep these grouped areas for each perch: Docks / Building 64; Warden's House / Citadel; Cell Blocks / Library; Roof / Infirmary; Cafeteria / Showers; Recreation Yard / Catwalk; and West Grounds.
• The bird draws from a very large fixed spawn pool and only re-rolls after a successful blast + round change — there is no single fixed route.
• Fourth-round white light appears at one of the restricted “orange-list” locations; the Temporal Gift elixir widens the short reveal window.

Return the Kronorium to the laboratory and place it on the dead body / reading stand, then interact to stop the pages. Use shield vision to read the four-symbol page code (per-match) and enter it at the Citadel keypad. A valid code lights the lighthouse beam, which points to one of five red orbs. Go to the lit orb and interact to begin that challenge; after each recovered stone, re-read the book for the next code and the beam points to the next challenge. The challenge order is book-determined and changes per match.

Tip: do the easiest challenges first and save New Industries for last, once you have a strong loadout, an upgraded shield and Undead Man Walking.

Each lit orb starts one challenge; complete it, recover its red stone, and return to the lighthouse for the next. All five must be done. Every challenge is escort- or shield-dependent, so keep spirit blasts charged and clear the route before you commit.

Solo vs co-op: all five are solo-completable. Co-op only eases crowd control on the escorts (Michigan Avenue and New Industries especially); the objectives are identical. Undead Man Walking + Monkey Bombs make the escorts dramatically safer.

• Docks — listen to the lighthouse Morse flashes, convert the groups to a number total (per-match) and enter it on the telegraph, then escort the ghost from the Infirmary toward the Docks. Fails on a wrong Morse sum or a lost ghost.
• Showers — carry the spectral banjo into the blue spirit circle and earn kills until it completes, returning the banjo before its damage/timeout turns lethal; repeat the circles for the stone.
• Michigan Avenue — escort a ghost from the Cafeteria through D-Block / Library / Cell Block; kill attackers before they touch it. Fails if the ghost takes too much damage.
• Power House — a five-round Simon Says: record the three lit Building 64 panels, translate the sticky-note symbols via the punch-card / monitor reference (per-match mapping), then spirit-blast the ghost exactly as it reaches each matching lever. Fails on a wrong symbol or blast timing.
• New Industries — start with full shield charges; use the shield key and spirit blasts to force the ghost through its route and turn it red WITHOUT letting it kill the other spirit, then finish it at the Spin Trap. Hardest of the five; save for last.

With all five red stones on the laboratory wall map, the hidden staircase / metal door opens. Fully gear up first — Pack-a-Punch your weapons, repair the shield, refill both spirit blasts, buy every perk, and set your equipment. The metal laboratory door is the point of no return. All players descend and interact as prompted, then stand clear of the central machinery until the first Warden cycle begins.

Do not descend with a nearly broken shield — the boss demands repeated spirit blasts and gives few chances to rebuild. An Attuned (upgraded) shield with four blasts is a large advantage here.

Three identical cycles: kill adds to gain shield-key souls, step into the active red cylinder around the large Warden and use the shield to survive the pressure, shoot the three red orbs on the mechanism, then spirit-blast the white orb that rises above it to advance one cycle. Avoid the lethal red floor circles. After the third cycle, Richtofen interacts with the machine and a cutscene pulls him away.

Survive the handoff: the remaining players now face an invulnerable Warden and endless adds — do NOT waste ammo on him. Kite, revive and use specialist/equipment until Richtofen re-enters. Then, as Richtofen, use the returned power/weapon sequence to make the Warden vulnerable and finish him.