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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.
September 30, 2026
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START HERE, RUNNER
RUNNER SHELLS: OVERVIEW
- In Marathon, you play as a Runner, a bio-cybernetic mercenary whose consciousness can be re-uploaded into a new Runner Shell after death.
- Runner Shells are specialized biosynthetic bodies designed for survival on Tau Ceti IV. Each Shell is built around a recognizable gameplay archetype, such as frontline combat, stealth, reconnaissance, mobility, recovery, or defensive control.
- Distinct silhouettes and abilities allow experienced players to identify potential threats before a fight begins, while Marathon’s buildcrafting systems let you customize how your chosen Shell performs.
- Rather than replacing a Shell’s core identity, customization is designed to strengthen, redirect, or specialize its natural capabilities.
HOW CUSTOMIZATION WORKS
- Your Runner build is shaped through several interconnected systems:
- Runner Shell — Determines your core ability kit, archetype, and gameplay identity.
- Cores — Shell-specific or specialized modifiers that enhance or alter abilities and traits.
- Implants — Universal equipment providing a fixed gameplay perk and a predefined package of Runner stats.
- The Cradle — Marathon’s broader statistical progression system, allowing you to invest Energy into Runner stats and unlock breakpoint perks.
- Weapons & Mods — Define your combat loadout and allow further specialization around range, movement, utility, or preferred engagement style.
- Together, these systems allow the same Shell to support different builds without erasing the strengths and weaknesses that define its archetype.
CORES VS IMPLANTS
- Customization in Marathon centers around two major systems:
CORE
- Cores are specialized modifiers designed primarily around individual Runner Shells.
- They can improve or alter specific abilities, traits, or playstyle loops, allowing you to lean deeper into what a Shell already does well, or reshape how part of its kit functions.
IMPLANTS
- Implants are universal equipment that can be used by any Runner Shell.
- Each Implant contains:
- One fixed gameplay perk
- One fixed package of Runner stats
- A total stat value determined by the Implant’s rarity
- Higher rarity increases the overall amount of stats provided, while certain specialized perks only appear at higher rarity tiers.
- This makes Implant selection more predictable: rather than hunting for random combinations, you can deliberately choose perks and stat packages that complement your Shell and preferred build.
THE CRADLE
- The Cradle is Marathon’s primary system for improving the baseline capabilities of your Runner Shells.
- Rather than requiring faction upgrades to increase core Runner statistics, Cradle progression gives you direct control over how your statistical power is distributed.
- Progression is shared across your Shell roster, allowing you to reconfigure your stats as you switch between different Shells, activities, and team roles.
HOW IT WORKS
- Matter Converter: Convert eligible weapons, equipment, and other items into Cradle experience.
- Cradle XP: Higher-quality items generally contribute more progression.
- Energy: Increasing your Cradle progression provides Energy to allocate.
- Stat Allocation: Energy can be distributed across Marathon’s Runner statistics.
- Breakpoint Perks: Reaching specific stat thresholds unlocks additional benefits.
- Free Reallocation: Cradle Energy can be reassigned without penalty, allowing you to experiment with different Shells and builds.
BUILDCRAFTING TIPS
- Convert With Purpose: Don’t automatically feed every spare item into the Matter Converter. Keep gear that supports your active builds and convert equipment you no longer need.
- Build Around the Shell: Use the Cradle to strengthen the natural strengths of the Runner Shell you’re currently playing.
- Experiment Often: Free Energy reallocation makes it easy to change your build before switching Shells, activities, or crew roles.
- Target Breakpoints: Rather than spreading Energy evenly across every statistic, consider building toward meaningful perk thresholds.
SYMBIOSIS & SHELL EVOLUTION
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.
BISHOP (PREVIEW)
Archetype: HUNTER-KILLER
- Bishop joins Marathon on December 8, 2026 with Symbiosis.
- Bungie describes Bishop as a high-performance robot samurai built around speed, surprise, and devastating bursts of melee damage.
- Unlike Sentinel’s defensive control or Assassin’s extended stealth, Bishop appears intended to deliver fast, surgical aggression—closing distance quickly and punishing targets through concentrated close-range pressure.
Toolkit
SENTINEL
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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 a defensive platform that neutralizes incoming explosives. Sentinel and nearby allies also gain increased weapon stability and reload speed while near the device. Its defensive ammunition is limited.
- Tactical — Snare Mine: Throws a proximity-triggered mine that detonates into Immobilizing submunitions when an enemy approaches.
- Trait — Prey Tracker: Displays moving enemies on radar within a forward-facing conical detection area. Prey Tracker is no longer scrambled by Signal Jammer as of the Season 2 mid-season balance pass.
- Passive — Castle Doctrine: Readies and reloads SMGs, Pistols and Shotguns faster depending on the number of nearby hostiles. Taking splash damage temporarily increases Hardware, Firewall and Self-Repair Speed.
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 Information: Use an already-deployed Riot Barricade to safely evaluate dangerous sightlines and create space for your crew. Avoid relying on rapid activation/deactivation as a scouting technique.
- 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.
- Invisibility Discipline: Remaining slow and deliberate makes invisibility substantially harder to detect.
- Continuous sprinting causes invisibility to flicker after roughly two seconds, while nearby AI can still react to footsteps at close range.
- Use camouflage to reposition and disengage rather than treating it as unrestricted invisibility.
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: Echo Pulse remains useful against invisible or Signal-Jammed targets.
- Signal Jammer no longer completely blocks Echo Pulse, although jammed Runners can appear using a UESC-style marker rather than a standard Runner identifier.
- 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: Cardio Kicks pair particularly well with Vandal, 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.
- Drone Bomb: One Claymore can be attached to a Pickpocket Drone, allowing creative offensive plays against entrenched targets. The Drone cannot carry multiple Claymores.
- 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 especially valuable in coordinated squad play to “erase” teammate mistakes.
ASSESS // NEXT
SCAVENGER: ROOK
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Archetype: SCAVENGER
- Rook is a specialized Shell built exclusively around Scavenger Mode.
- Unlike standard Runner Shells, Rook joins a match already in progress as a solo player and does not risk a personally assembled loadout.
- The goal is to adapt to whatever remains in the zone, scavenge useful equipment, and escape with value.
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.
Key Mechanics
- Compromised Gear: Some Rook equipment cannot normally survive extraction unless stabilized with a Matter Fixative.
- Recuperation: Rook has built-in recovery that helps regain health after surviving dangerous encounters, reducing dependence on finding Patch Kits.
- Signal Mask: Helps Rook move through UESC-controlled environments with reduced detection pressure, although stealth still requires careful movement.
- Zero Personal Risk: Because Rook doesn’t deploy using your normal prepared loadout, Scavenger Mode remains useful for rebuilding resources, learning zones, or attempting a zero-to-hero run.
PLAYER PROFILE ASSESSMENT
- Rook is a low-risk scavenger shell.
- Pick Rook if you want an opportunistic, low-investment scavenging experience where adaptation matters more than arriving with a perfected build.
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 frontline pressure, reliable intel, and strong sustain create a flexible crew that can adapt to most situations. | Coordinated groups, general exploration, and crews still learning which playstyle suits them. |
| The Fortress | Sentinel + Destroyer + Triage | Layer explosive denial, Riot Barricade protection, healing, and close-range pressure to make a defensible position extremely difficult to push. | Cryo Vaults, contested objectives, restricted spaces, and difficult extractions. |
| The Tripwire | Sentinel + Recon + Assassin | Recon identifies approaching crews, Sentinel controls their route with defensive tools, and Assassin attacks from an unexpected angle once the engagement begins. | Ambushes, chokepoints, and coordinated crews that prefer fighting on their own terms. |
| The Secure Extraction | Sentinel + Thief + Triage | Sentinel protects the objective area, Thief prioritizes valuable loot and mobility, and Triage provides recovery if the crew is pressured during extraction. | High-value loot runs where successfully leaving with the objective matters more than chasing fights. |
| The Aggressive | Destroyer + Recon + Assassin | Use Recon intel to identify vulnerable targets while Destroyer applies direct pressure and Assassin creates dangerous flanking angles. | PvP-focused crews actively hunting other teams and contesting high-value loot. |
| The Eco-Focus | Thief + Vandal + Triage | Vandal creates disruption while Thief moves efficiently through valuable loot routes and Triage keeps the crew healthy enough to disengage when needed. | Fast in-and-out runs designed to rebuild resources and grow your Stash. |
| The Invisible Hand | Assassin + Recon + Thief | Gather information first, approach carefully, and use stealth and mobility to begin fights from advantageous positions rather than committing to prolonged direct engagements. | Patient players who prefer ambushes, stealth, and outmaneuvering opposing crews. |
| The Wall of Steel | Destroyer + Destroyer + Triage | Layer Riot Barricades and healing to make a room, objective, or extraction point significantly harder for an opposing crew to push. | Defending high-value Vaults, narrow interiors, and late-run extractions. |
| The Blitzkrieg | Vandal + Vandal + Recon | Recon provides targeting information while two Vandals use speed, verticality, and disruption to attack from rapidly changing angles. | High-skill crews that enjoy fast movement, aggressive rotations, and chaotic engagements. |
| The Safety Net | Destroyer + Vandal + Triage | Destroyer provides dependable frontline presence, Vandal creates openings, and Triage gives the crew room to recover when a fight becomes messy. | Learning new maps, teaching newer players, and crews that want a forgiving mix of offense and recovery. |
| The Loot Vacuum | Thief + Thief + Triage | Multiple Thieves prioritize higher-value loot routes and rapidly clear useful containers while Triage protects the crew's ability to recover and extract. | Rebuilding inventory, farming valuables, and efficient economy-focused runs. |
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 approaching fights deliberately and striking first. | You like flanking, isolating targets, repositioning under camouflage, and punishing players who overextend. |
| Recon | Intel & Tracking | Tactical, information-driven, and especially useful in coordinated squads. | You want to track enemy movement, reveal threats, and help your crew make better decisions before committing to a fight. |
| Vandal | Disruption | Fast, aggressive, and built around movement, pressure, verticality, 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 especially effective at locating and extracting valuable loot. | You care about smart pathing, valuable items, efficient looting, and getting out alive more than taking every available fight. |
| Triage | Team Support | Healing-focused, team-oriented, and particularly strong during longer engagements. | You want to keep your squad alive, recover from bad fights, and provide reliable utility during extended runs. |
| Sentinel | Defense & Area Control | Defensive, tactical, and built around controlling space, disrupting explosives, and punishing aggressive pushes. | You want to protect your crew, secure objectives or exfils, trap aggressive teams, and make dangerous areas harder for enemies to enter. |
| Rook | Scavenger Runs | Lower-investment, solo-only, and centered around adapting to an in-progress match. | You want a lower-risk way to rebuild resources, learn zones, scavenge equipment, or attempt a zero-to-hero run. |
| Bishop Arrives Dec 8 | Close-Range Hunting | Fast, surgical, and designed around speed, surprise, and powerful bursts of melee pressure. | You want an aggressive hunter-killer built for closing distance quickly. Full recommendations will be added after Bishop's complete ability kit is revealed. |
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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