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Marathon: Runner Shells – All Shells, Cores, Implants & Rook Mode
Runner Shells are the moddable biosynthetic bodies you inhabit on runs to Tau Ceti. Let's dive in, Runner. This page explains how cores/implants work, key details about each runner shell, and squad formation recommendations.
The Important Details
- You are a Runner, a biosynthetic body designed for high-risk operations on Tau Ceti IV.
- You’ll get to tailor your shell through core, implant, weapon and mod systems.
- Cores strengthen a shell’s capabilities.
- Implants grant bonuses and perks.
- This page dives into each shell archetype. Ready to begin? Scroll down below.
June 3, 2026
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START HERE, RUNNER
RUNNER SHELLS: OVERVIEW
- In Marathon, you don’t play as a fragile human soldier. You inhabit a Runner Shell… a biosynthetic body designed for high-risk operations on Tau Ceti IV.
- Your consciousness transfers into these shells, allowing you to enter dangerous combat zones without permanent death. Each shell is built around a specific gameplay archetype, giving it a natural lean toward roles like intel gathering, disruption, mobility, or combat support.
- Shells have distinct silhouettes, making it easier to identify threats in the field and quickly assess how an opponent might engage.
- Runner Shells are modular platforms designed for customization.
HOW CUSTOMIZATION WORKS
- Every run begins with decisions.
- You tailor your shell’s playstyle through a combination of:
- Cores
- Implants
- Weapons
- Mods
- These systems allow you to adjust movement, survivability, utility, and combat effectiveness.
- Bungie describes this as building around a shell’s “natural strengths” rather than replacing them entirely.
- This creates flexibility: the same shell can feel very different depending on your loadout.
CORES VS IMPLANTS
- Customization in Marathon centers around two major systems:
CORE
- Cores are generally shell-specific enhancements.
- They modify or strengthen a shell’s inherent abilities.
- For example, Bungie highlights the Thief shell using cores to:
- Improve survivability
- Reduce ability cooldowns
- Enhance infiltration capabilities
- Cores reinforce identity.
IMPLANTS
- Implants are more universal…any shell can equip them!
- Implants:
- Grant stat bonuses
- Include a random perk
- Higher-tier implants add an additional fixed perk
- Bungie uses the example of a high-tier implant called Ping+ V5, which boosts the Recon shell’s Echo Pulse ability while also granting an extra perk.
- Implants expand possibility across shells.
THE CRADLE
- The Cradle is Marathon’s Season 2 progression system for improving your Runner Shells.
- It replaces the older feeling of chasing shell upgrades through faction paths.
- The system empowers the WEAVEworms that create your biocybernetic body.
- Progression is shared across all Runner Shells, meaning your investment benefits your overall account for the season.
- Cradle progression resets at the start of a new season.
- Use it if: You want more direct control over your Runner’s stats, perks, and playstyle.
- Best For: Players who like experimenting, optimizing, and changing builds depending on the map or role.
HOW IT WORKS
- Matter Converter: Convert weapons, equipment, and other items into Cradle experience.
- Cradle XP: Better-quality items provide more experience.
- Energy: Leveling the Cradle earns Energy.
- Stat Allocation: Energy can be placed into six stat categories.
- Perk Breakpoints: Reaching certain stat thresholds unlocks additional perks.
- Free Respecs: Energy can be reallocated at any time with no penalty, allowing you to adjust your build freely.
TIPS & TRICKS
- Convert With Purpose: Do not blindly feed everything into the Matter Converter. Keep gear you actively use, then convert excess or lower-priority items.
- Build Around Your Shell: Use the Cradle to support the Runner Shell you play most. For example, Sentinel benefits from durability, close-range pressure, and defensive play.
- Experiment Often: Since Energy can be reallocated freely, adjust your stats before changing shells, maps, or team roles.
- Seasonal Mindset: The Cradle resets each season, so treat it as your current seasonal buildcrafting hub rather than permanent account progression.
- Breakpoints Matter: Do not just spread Energy evenly. Push toward perk unlocks when possible.
RUNNER SHELL BREAKDOWN
- Here is a list and general details surrounding every runner shell that we know so far.
- How to Videos are created by the content creator, HOLLOWTIDE.
- HOLLOWTIDE creates videos about games, such as Marathon and Halo, and uploads them to YouTube regularly!
- Like their content? Follow their YouTube channel!
- Other videos by Bungie and Perfect Game Whatever.
SENTINEL
Archetype: DEFENSIVE Specialist
- Sentinel is built for area control, team protection, and anti-rush defense.
- It specializes in shaping fights before enemies fully commit.
- This shell is designed to control space through defensive tools, traps, and short-range intel.
- Sentinel is especially useful when holding rooms, protecting exfils, or punishing aggressive teams.
Toolkit
- Prime: Defender System
- Deploys an automated laser platform.
- Destroys incoming enemy grenades and missiles.
- Boosts weapon handling for nearby crewmates.
- Has limited charges, so it cannot block projectiles forever.
- Tactical: Snare Mine
- A thrown proximity-triggered mine.
- Detonates into immobilizing submunitions.
- Best used to punish pushes, cover chokepoints, or trap enemies during retreats.
- Passive Trait: Castle Doctrine
- Grants increased resistance after taking splash damage.
- Improves close-range weapon handling when surrounded by enemies.
- Trait Ability: Prey Tracker
- Activates a short-range motion-tracking system.
- Shows nearby moving targets on radar.
- Helps Sentinel prepare defenses before enemies fully collapse on their position.
Tips & Tricks
- Anchor the Fight: Sentinel is strongest when defending a position, not chasing every sound across the map.
- Protect Final Exfils: Defender System can help protect your crew from grenade or missile pressure during high-stakes extraction moments.
- Trap the Push: Place Snare Mines near doors, stairs, corners, revive angles, and loot-heavy choke points.
- Call Out Radar Pings: Prey Tracker gives valuable nearby movement information. Share that intel with your crew.
- Pair With Close-Range Weapons: Sentinel naturally benefits from close-range pressure, especially when enemies try to collapse on your position.
PLAYER PROFILE ASSESSMENT
- Sentinel is a defensive control shell.
- Pick it if: You like protecting teammates, locking down rooms, holding extraction points, or punishing reckless enemy pushes.
- Why: Its kit gives your crew breathing room through projectile denial, traps, and short-range intel.
- Playstyle Match: You are the player who turns a chaotic push into a bad decision for the enemy team.
- Destiny Comparison: You are a Sentinel Titan in Destiny…holding the line, protecting the fireteam, and daring enemies to push through you.
ASSESS // NEXT
DESTROYER
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Archetype: Combat Specialist
- The Destroyer is built for frontline engagements.
- It emphasizes durability and sustained combat presence.
- This shell appears designed to anchor fights and control space.
Toolkit
- Prime: Shoulder mounted heat-seeking missile pods
- Tactical: A deployable Riot Barricade
- Traits: Thrusters for movement and positioning
Tips & Tricks
- Barricade Peeking: Use the Riot Barricade to peek around corners in third-person view to scout safely.
- Timed Pressure: Do not activate your Search and Destroy (missiles) too early; apply sustained damage first to force a panic, then trigger them to secure the finish.
- Aggressive Revives: Deploy your shield to protect yourself while reviving a teammate in a dangerous sightline.
PLAYER PROFILE ASSESSMENT
- Destroyer is an aggressive frontline shell.
- Pick if: You like a “brawler” playstyle, leading the charge, or are a beginner looking for a forgiving, durable kit. You are a Titan in Destiny.
- Why: Its Riot Barricade provides physical cover for the team, and its homing missiles apply constant pressure on enemies, making it the primary “frontline” for any squad.
ASSESS // NEXT
ASSASSIN
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Archetype: SHADOW AGENT
- The Assassin leans into stealth and tactical engagement.
- The focus is on repositioning, surprise, and eliminating targets before they can respond.
Toolkit
- Prime: Smoke deployment (fields of smoke)
- Tactical: Active Camouflage
- Traits:
- Deploy smoke field while airborne
- Trigger camouflage when entering smoke fields
Tips & Tricks
- Shadow Dive Utility: Use Shadow Dive while airborne to slam into the ground and negate all fall damage.
- The Stealth Loop: Smoke first, reposition using Active Camo, take a guaranteed shot, then vanish before the enemy can trade back.
- Exit Timing: Invisibility flickers off when taking damage or shooting; use those final seconds of a match to vanish right as the extraction ship arrives.
- Note: Your invisibility is near 100% when standing still. It becomes more noticeable with movement.
PLAYER PROFILE ASSESSMENT
- Assassin is a stealth and stalker shell.
- Pick if: You primarily play solo or enjoy a “high-risk, high-reward” ambush playstyle.
- Why: It offers full invisibility and smoke screens to control engagement windows and safely disengage if a fight goes south.
- In squads, it’s used for precision flanks while the enemy is distracted.
ASSESS // NEXT
RECON
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Archetype: INTEL SPECIALIST
- Recon shells are information machines.
- This shell helps teams anticipate movement and detect threats before direct contact.
Toolkit
- Prime: Echo Pulse – sonar pulses to detect nearby hostiles
- Tactical: Tracker drones that track down nearby hostiles, exploding in proximity causing enemies to overheat
- Traits:
- Receive warning when you are pinged; finishers ping other enemy crew members
- Holographic footstep trails when breaking enemy shields
Tips & Tricks
- Counter-Stealth: Use Echo Pulse to reveal invisible targets like Assassins or those using Signal Jammers.
- Forced Overheat: Use the Tracker Drone to hunt enemies and force them to overheat, effectively locking down their movement abilities.
- Live Pings: Performing a finisher on a downed Runner pings their entire crew’s location for your team.
PLAYER PROFILE ASSESSMENT
- Recon is an intel-tactical shell.
- Pick if: You prefer strategic advantages, hunting other players, or being the “eyes and ears” of your team. Not built for head to head combat, but for – well – recon!
- Why: Recon excels at information control, using Echo Pulse to reveal invisible targets and tracking enemies through walls after breaking their shields.
- It is perfect for players who want to decide exactly when and where a fight happens.
- I don’t know about you, but I usually like a little more intel with my intel.
ASSESS // NEXT
VANDAL
Archetype: Combat Anarchist
- The Vandal emphasizes high mobility and disruption.
- This shell rewards aggression and creative traversal.
Toolkit
- Prime: Amplify – Reduce heat generated and increase movement speed and weapon dexterity
- Tactical: Turn your arm into a cannon to damage hostiles.
- Traits:
- Secondary jump while airborne, but generate more heat
- Supercharged slide, but generate more heat
Tips & Tricks
- Rocket Jumping: Aim the Disruptor (arm cannon) downward to launch yourself airborne for insane flanking routes.
- Heat Management: Always pair Vandal with Cardio Kicks, as they instantly clear heat and provide movement buffs essential for chaining Microjets and Power Slides.
- Amplify Chain: Use Amplify to boost weapon handling and decrease the heat cost of movement, allowing you to overwhelm opponents with speed.
PLAYER PROFILE ASSESSMENT
- Vandal is a movement & combat anarchist shell.
- Pick if: You have high mechanical skill and enjoy fast-paced, vertical gameplay and disrupting enemy formations.
- Why: Built for constant motion, Vandal uses Microjets for double jumps and a Disruptor cannon to blast enemies out of cover.
- It has a high skill ceiling focused on chaining movement without overheating.
ASSESS // NEXT
THIEF
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Archetype: Covert Acquisition
- The Thief excels at infiltration and objective manipulation.
- The Thief is built to move quickly, scout safely, and extract efficiently.
Toolkit
- Prime: Pilot a butterfly drone to locate enemies and steal their loot.
- Tactical: Use a grapple, like Destiny 2’s Strand.
- Traits:
- Activate an X-ray visor to highlight hostiles and loot; while active, aiming at hostiles disrupts their vision.
- Gain improved weapon readiness (handling) and grapple recharge rate based on how many items are in your backpack.
Tips & Tricks
- Backpack Buffs: Don’t equip your backpack immediately; fill it with items first to maximize the cooldown reduction granted by higher-tier cores.
- Explosive Drones: You can place Claymores on top of your Pickpocket Drone and fly it into enemy positions for free “drone bomb” damage.
- Escape Artist: Save the Grapple use for rapid vertical movement to escape danger; avoid overstaying in one spot while piloting the drone.
- When piloting, make sure you’re in a secure hidden location.
- There is a Superior (purple) rarity core called Hideout that can help make you invisible when piloting a drone…it is commonly paired with the “Premium Package” core (to improve drone durability) or “Partner in Crime” (to allow the drone to ping enemies when not in use).
PLAYER PROFILE ASSESSMENT
- Thief is a loot specialist shell with covert acquisitions.
- Pick if: You prioritize gathering high-value loot and extracting safely over constant combat.
- Why: With an X-Ray Visor that highlights loot through walls and a Pickpocket Drone for remote scavenging, Thief is built to maximize the profit of every run.
ASSESS // NEXT
TRIAGE
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Archetype: Field Medic
- Triage supports allies through recovery and enhancement.
- This shell appears designed for team sustain and mid-fight stabilization.
Toolkit
- Prime: Revive crew members or EMP hostiles.
- Tactical: Activate med drones that regenerate ally health and shields
- Traits:
- Medical consumables are shared with your crew when med drones are attached to them
- Boost performance of your weapons for a short time
Tips & Tricks
- Consumable Sharing: Any ally with a Med Drone attached receives a copy of any consumable you use (like Cardio Kicks or Energy Amps) through the Shareware trait.
- Ranged Revives: Use Capacitive Gauntlets to revive downed teammates from a distance instead of exposing yourself.
- Multi-Target Revive: Your ultimate can target up to two players at once if they are close together, allowing for a double revive.
PLAYER PROFILE ASSESSMENT
- Triage is a support shell.
- Pick if: You enjoy being the “backbone” of a squad and prioritizing team survival over raw kills.
- Why: Triage is the only shell capable of delivering ranged revives and mirroring its own healing to allies via the Shareware trait.
- It is considered nearly essential for coordinated squad play to “erase” teammate mistakes.
ASSESS // NEXT
SCAVENGER: ROOK
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Archetype: SCAVENGER
- Rook is a unique shell designed specifically for Scavenger Mode.
- Unlike other shells, Rook has specific rules to follow:
- Enters a match already in progress
- Drops in solo
- Starts with no loadout
- Risks nothing upon entry
NOTES
- This shell offers a lower-risk, opportunistic playstyle.
- It allows players to enter an active environment, gather resources, and exit without committing a pre-built kit.
- Rook represents a different rhythm of play… reactive, adaptive, and opportunistic.
Tips & Tricks
- Gear Stabilization: Rook’s main gear is typically destroyed upon extraction, but you can find Matter Fixatives (dropped by commanders) to stabilize “unstable” items and keep them permanently.
- Bot Blending: With capstone upgrades, Rook can blend in with UESC AI bots to surprise and wipe enemy teams.
PLAYER PROFILE ASSESSMENT
- Rook is a low-risk scavenger shell.
- Pick if: You are a beginner learning the map or a player looking for “zero-to-hero” runs without risking your personal gear.
- Why: Rook is a solo-only shell that allows you to join in-progress matches and blend in with AI bots, making it the safest way to rebuild your inventory after a loss.
ASSESS :// SQUAD FORMATION
- Here are some recommended squad formation tips, and general survival tips.
| Composition Name | Shell Lineup | Primary Strategy | Best For... |
|---|---|---|---|
| The All-Rounder | Destroyer + Recon + Triage | Balanced defense, constant intel, and high sustain. The "Gold Standard." | Coordinated groups and general map exploration. |
| The Aggressive | Destroyer + Recon + Assassin | Intel-driven flanks and heavy combat pressure to wipe other squads. | PvP-focused players looking to hunt for high-tier loot. |
| The Eco-Focus | Thief + Vandal + Triage | Chaos for distraction, efficient looting, and safe, fast extraction. | Fast "in-and-out" runs to build up your Stash. |
| The Invisible Hand | Assassin + Recon + Thief | Stealth-based ambushes; finding targets and engaging only on your terms. | Players who prefer "rat" gameplay or outsmarting opponents. |
| The Wall of Steel | Destroyer + Destroyer + Triage | Rotating Riot Barricades to hold a single room or extraction point indefinitely. | Defending high-value Vaults or late-game extractions. |
| The Blitzkrieg | Vandal + Vandal + Recon | Extreme verticality and speed; attacking from the ceiling to disorient teams. | High-skill players who enjoy fast-paced, chaotic movement. |
| The Safety Net | Destroyer + Vandal + Triage | A "forgiving" setup where the Destroyer tanks and Triage fixes mistakes. | Learning new maps or teaching friends the basics of the game. |
| The Loot Vacuum | Thief + Thief + Triage | Using multiple X-Ray Visors to ignore "trash" rooms and hit only high-value crates. | Rebuilding your inventory quickly after a massive losing streak. |
WHICH RUNNER SHOULD YOU PICK?
| Runner Shell | Best For | Playstyle | Pick This If... |
|---|---|---|---|
| Destroyer | Frontline Combat | Durable, direct, and built for holding ground during messy fights. | You want a reliable combat shell that can pressure enemies, protect teammates, and survive longer engagements. |
| Assassin | Ambush Plays | Stealth-focused, mobile, and strongest when striking first. | You like flanking, isolating targets, disappearing from danger, and punishing players who overextend. |
| Recon | Intel & Tracking | Tactical, information-driven, and valuable for coordinated squads. | You want to track enemy movement, control engagements with information, and help your team make smarter decisions. |
| Vandal | Disruption | Fast, aggressive, and built around pressure, movement, and chaos. | You enjoy high-tempo gameplay, forcing enemies out of position, and creating openings before they can stabilize. |
| Thief | Loot Runs | Covert, objective-focused, and ideal for extracting value. | You care more about smart pathing, valuable loot, and getting out alive than taking every fight. |
| Triage | Team Support | Healing-focused, team-oriented, and strongest in coordinated groups. | You want to keep your squad alive, recover from bad fights, and provide strong utility during longer runs. |
| Sentinel | Defense & Area Control | Defensive, tactical, and built around holding space, denying explosives, and punishing enemy pushes. | You want to protect your squad, secure rooms or exfils, trap aggressive teams, and turn enemy pressure into a bad decision. |
| Rook | Scavenger Runs | Lower-risk, solo-only, and designed for rebuilding your inventory. | You need a recovery run, want to scavenge supplies, or are learning the basics without risking a full loadout. |
SURVIVAL TIPS FOR SQUADS
- The Triage “Mirror”: If you have a Triage, let them be the one to use expensive consumables (like Energy Amps) so the whole team gets the buff for free.
- Recon Pings: Even if you aren’t in a fight, have your Recon pulse near Extraction Zones to check for “exit campers” hiding in bushes or corners.
- Destroyer Cover: Use the Riot Barricade to block narrow doorways while your Thief loots a chest, giving them a safe 10-second window.
FALLOUT PLAYS TIPS
- Fallout Plays has a fantastic video with helpful tips to make your gameplay better!
- Fallout Plays also creates helpful videos for other games like Destiny! Check out his channel here!
END
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