Rex Infernus Easter Egg Guide: Full BO7 Zombies Walkthrough

Cracking the main quest on Rex Infernus is more than just about surviving rounds. It requires precise puzzle timing, absolute map awareness, and a loadout built for high-round boss damage. 

Activision increased enemy scaling in the subterranean layers following the Season 05 Reloaded Announcement, and the difficulty reflects it. If you’d rather skip the trial-and-error, check out our BO7 Easter Egg Boost (Standard Mode) for a first-try clear without the extra grind. 

Here is the complete step-by-step walkthrough, puzzle solution breakdown, and loadout strategy to help you conquer Rex Infernus on your own. 

Recommended Loadout & Squad Preparation

Before opening a single door, tune your field setup. Running this quest with random gear leads to wiped runs by Round 20.

Best Weapons, Field Upgrades & GobbleGums

Category	Recommended Selection	Tactical Role & Operational Purpose
Primary Weapon	Marine SP Shotgun or High-Mobility LMG	Shreds heavy elite armor in close-quarters engagements.
Field Upgrades	Aether Shroud & Healing Aura	Aether Shroud: Mandatory for safe puzzle interactions under fire. Healing Aura: Sustains squad survival during the Dravakar cleanse phase.
GobbleGums & Consumables	Perkaholic, Pack a Punching, Near-Death Experience	Maxes perk slots, boosts weapon damage tier, and provides emergency team revives. (Keep an extra Self-Revive handy for the final arena)

Combat Strategy Notes

• Shotgun Priority: Use the Marine SP Shotgun to stagger elites breaking into your team’s puzzle perimeter instantly.
  
• Aether Shroud Timing: Activate Aether Shroud right before starting timed puzzle interactions to guarantee uninterrupted input sequences.
  
• Arena Safety Net: Reserve Near-Death Experience specifically for the final boss encounter to maintain full perk stacks during down states.

If you need to level up your gear fast to unlock high-tier attachments, pick up Call of Duty BO7 Double XP Codes For Sale to cut down the weapon grind.

Phase 1: Escape Her House & Unlock Pack-a-Punch

Your run begins inside the cursed residential section. Move fast to keep round numbers low.

Her House Phone Event & Door Unlock

Step #	Location / Target	Required Action	Objective / Output
01	Her House (Upper Hallway)	Locate Rotary Phone	Find the vintage phone station on the top floor
02	Rotary Phone Station	Interact & Listen	Count the three sets of distantly chiming bell tones carefully
03	Front Door Keypad	Input Code	Enter the chime counts sequentially on the keypad (e.g., 3-1-4)
04	Courtyard Barrier	Step Through Doorway	Cross the opened threshold to start the BO7 Rex Infernus main quest steps

Key Hints & Verification

• Audio Cue Verification: Make sure the game audio is clear. The chime counts vary per match. If you miscount, wait 10 seconds for the phone to reset its sequence before retrying.

• Squad Coordination: Have one teammate clear incoming zombies in the lower hallway while the code is being deciphered to avoid taking damage mid-interaction.

Rex Infernus Pack-a-Punch Unlock

To complete the Rex Infernus Pack-a-Punch unlock, head down into the Nexus Forge:

Step #	Target / Objective	Interaction & Mechanics	Success Criteria
01	Dread Skulls	Search catacomb altar shelves and drainage grates to collect three Dread Skulls	Collect all 3 skulls
02	Forge Pedestals	Place the gathered skulls onto the pedestals surrounding the central anvil	Mount all 3 skulls
03	Central Anvil	Defend position and survive a 60-second lock-in wave while the anvil charges.	Machine rises from magma basin.

Tactical Operational Notes

• Exploration Tip: Check dark corners near drainage grates first—the skulls emit a faint purple glow that stands out against the catacomb walls.
  
• Defense Strategy: Use high-mobility weapons or crowd-control field upgrades to clear the tight catacomb perimeter during the 60-second lockdown wave.

Claiming the Void Claw Grapple Hook

After Pack-a-Punch powers up, look toward the collapsed bridge in the forge room. Interact with the glowing purple crest to pull the base Void Claw Grapple from the wall. You will need this tool to navigate the outer ruins and access high platforms.

Need a hand optimizing team composition or boss DPS? Check out our detailed BO7 Warden Boss Fight Guide before setting foot in the arena. 

Phase 2: Assembling the Warden’s Blight & Upgraded Void Claw

You can’t open the final door without specialized gear. Secure the Warden’s Blight and upgrade your Void Claw early. You’ll need the crowd control and vertical mobility to navigate the lower depths without burning through self-revives. 

Warden’s Blight Wonder Weapon Quest Steps

Completing the Warden’s Blight Wonder Weapon quest requires three distinct components:

Part Name	Location	Operational Instructions & Requirements
Blighted Core	Dravakar Temple	Eliminate a Catalyst Zombie directly adjacent to the forge pipe
Sanctuary Crystal	Nyxara Sanctuary	Grapple to the highest rafter and shoot down the hanging crystal cluster
Etched Housing	Underground Lab	Purchase the Key Card near Her House (1,500 Points) to unlock the lab safe
Warden’s Blight	Nexus Forge	Assemble all three collected components at the main workbench

Crafting & Acquisition Strategy

• Blighted Core Execution: Bait a Catalyst Zombie toward the pipe before landing the final blow. The core only drops if the zombie perishes within proximity of the forge pipe.

• Point Management: Reserve 1,500 points early in the round to buy the Key Card from the Her House table to avoid delays when accessing the lab.

• Workbench Assembly: Once all three items are in your inventory, interact with the primary workbench inside the Nexus Forge to finalize the wonder weapon build.

Upgraded Void Claw Grapple Route

To forge the upgraded Void Claw grapple, take your base hook to the shadow-infested chasm near Nyxara. Target three purple runes on distant pillars while grappling mid-air. 

Hitting all three without touching the ground upgrades your grapple, adding double-range reach and a shockwave attack upon landing.

Phase 3: The Shadowsmith Sanctuary Puzzles

This phase contains the densest puzzles of the entire easter egg. Mistimed interactions reset your progress and spawn extra elite enemies.

Dravakar Temple Cleanse Sequence

Follow this exact procedure for the Dravakar Temple Cleanse guide:

1. Locate Four Stone Pillars: Inspect the main chamber to identify each carved rune.
   
2. Match Ceiling Constellations: Align the pillar runes with the glowing symbols displayed on the central ceiling dome.
   
3. Sequence Activation: Pull the corresponding wall levers in numerical order based on the ceiling constellation mapping below.

Activation Sequence & Rune Layout

Activation Step	Pillar Location	Symbol Type	Trigger Action	Operational Notes
01	North Wall	Flame Crown	Pull First	Initiates the chamber alignment phase
02	East Wall	Serpent	Pull Second	Stabilizes energy flow along the eastern conduit
03	South Wall	Broken Blade	Pull Third	Unlocks the lower vault locks
04	West Wall	Twin Moons	Pull Fourth	Finalizes the cleanse sequence

Protocol Hints

• Sequence Sensitivity: Do not pull levers based on cardinal directions. Match your ceiling dome’s poem line to the exact lever pull sequence.

• Visual Verification: Confirm the symbol on the ceiling dome lights up brightly after each successful pull before moving to the next pillar.

Pulling the wrong lever triggers a penalty wave of Armored Abominations. Double-check your symbols before touching anything.

Rex Infernus Veytharion Puzzle Solver

For the Rex Infernus Veytharion puzzle solver section, you will see four floating stone cubes inside the Veytharion chamber:

1. Equip the Warden’s Blight.
   
2. Shoot the floating cubes to rotate their faces until the glowing ley-lines align continuously across all four blocks.
   
3. Fire your Void Claw at the central orb once the lines lock into place.

Ending up with the wrong alignment results in direct damage to your squad. Take your time.

Caltheris Plate Puzzle & Shimmering Thread Farm

Stand on the four press plates around the outer rim of the chamber in simultaneous sequence. Keep one player per plate while zombies spawn continuously. 

Collect 10 Caltheris Shimmering Thread drops from killed elites to charge the binding seal.

Phase 4: Rebuilding the Nexus & Entering the Sanctum

With all components secured and puzzles solved, return to the Nexus Forge.

1. Insert the charged binding seal into the forge central altar.
   
2. Place the Warden’s Blight onto the pedestal to absorb energy.
   
3. Verify your armor, ammo, and Perks.

Interacting with the portal gate triggers a hard point of no return. Ensure your team is fully packed and stocked with self-revives before stepping through.

Phase 5: Rex Infernus Warden Boss Fight Strategy

The final battle takes place inside a shrinking arena surrounded by magma. Executing a solid Rex Infernus Warden boss fight strategy requires strict phase management.

Phase 1–3 Boss Mechanics & Wipe Attacks

Engagement Phase	Key Threat / Attack Type	Boss Behaviors & Arena Hazards	Evacuation & Survival Countermeasure	Weak Spot & DPS Focus
Phase 1	Ground Slam & Cleave	Charges across the arena room, leaving behind lingering fire pools.	Maintain maximum engagement distance and avoid fire pools.	Glowing Chest Core
Phase 2	Shadow Wipe Nova	Arena darkens as boss channels a room-wide instant-down wipe wave in center ground.	Grapple immediately to elevated side ledges using the Upgraded Void Claw.	Maintain ledge position until Nova completes
Phase 3	Enraged DPS Race	Gains 2x movement speed and continuously summons elite add waves.	Deploy Monkey Bombs or activate Aether Shroud to divert elite adds.	Head Core (Dump remaining Warden’s Blight ammo)

Phase 2 Tactical Arena Spatial Layout

Arena Zone	Elevation Level	Combat Designation	Tactical Utility & Positioning
Elevated Side Ledges	High Ground	Safe Evacuation Zone	Primary refuge to avoid the ground-level Shadow Wipe Nova
Grapple Anchor Points	Mid / High Transit	Escape Vectors	Access routes using the Upgraded Void Claw to reach safe ledges
Main Arena Center	Ground Level	Danger Zone (Wipe Hazard)	Channeling ground zero for the Warden’s room-wide Nova attack

Operational Protocol Notes

• Phase 2 Grapple Execution: Ensure the Upgraded Void Claw is equipped before Phase 2. The Nova wave hits the entire floor area, and standing on ground level results in an instant wipe.
  
• Phase 3 Resource Dump: Save all specialized ammo for the Warden’s Blight and field support items exclusively for Phase 3 to burn down the boss’s enraged health pool before the arena is overrun.

Want to show off your boss fight victories with exclusive cosmetic gear? Take a look at our breakdown of BlackCell Challenge Rewards and Requirements to unlock top-tier camos. 

Rex Infernus Easter Egg Main Quest Rewards

Clearing the quest unlocks substantial rewards for your account:

• Exclusive Infernal Warden Operator Skin
• Animated Veytharion Sanctum Calling Card
• 50,000 XP direct account bonus
• Permanent Zombie Master Dark Ops achievement unlock

Final Thoughts

The Rex Infernus quest demands fast execution, flawless puzzle work, and a build that can handle intense boss wipes. Master the Dravakar lever patterns, keep your grapple ready for Phase 2, and down the Warden before the arena fully closes in. 

If you want to skip the entire struggle altogether, check out our reliable Call of Duty BO7 Boosting Services to clear quests with expert players.

Frequently Asked Questions (FAQ)

Can you complete the Rex Infernus Easter Egg solo?

Yes. All puzzle interactions and boss mechanics scale for solo players. Use Aether Shroud during the Dravakar lever steps to prevent getting overwhelmed while inputting codes.

What happens if you fail the Dravakar pillar switch combination?

Failing the sequence spawns an immediate penalty wave featuring three Armored Abominations. You must clear all spawned elites before the levers reset for another attempt.

How do you get the Bloodthorn Wonder Weapon skin variant?

Complete the main quest under Round 20 while keeping all squad members from downing during the final Warden phase.