If weapons decide how you fight in Marathon, then cores decide what your runner is actually capable of doing. Two players using the same runner shell can feel completely different in a match simply because their core setups are different. One Assassin might play like a silent infiltrator, while another becomes an aggressive melee hunter.
That’s the power of the core system.
This guide breaks down how cores work, what the rarity tiers mean, and how different runner shells use them to shape their playstyle.
Marathon Cores Guide – All Runners, Core Rarities
Cores are runner-specific upgrades that modify abilities and mechanics. They are not just small stat boosts. Many of them fundamentally change how your abilities behave.
For example, a core might:
- Extend invisibility duration
- Turn defensive abilities into offensive tools
- Change how healing or shields function
- Create new ability combos
Every runner shell has its own dedicated core pool, meaning cores cannot be swapped between runners.
Assassin cores only work on Assassin.
Destroyer cores stay with Destroyer.
Recon cores remain exclusive to Recon.
Each loadout has two core slots, and you cannot equip the same core twice.
Right now the game includes 77 total cores, spread across all runner shells.
A simple way to understand the system:
Cores change what your abilities do.
Implants change your stats.
Both systems work together to define a strong build.
Core Rarity Tiers and Credit Cost
Each core belongs to one of five rarity tiers, and the rarity determines how impactful the effect is.
| Tier | Credit Cost | Effect Strength |
|---|---|---|
| Standard | 35 Credits | Small passive bonuses |
| Enhanced | 70 Credits | Trigger-based effects |
| Deluxe | 200 Credits | Significant ability changes |
| Superior | 600 Credits | Playstyle-changing improvements |
| Prestige | 2,500 Credits | Build-defining mechanics |
Standard cores are cheap and easy to acquire. Even though they aren’t flashy, they should always be equipped early on.
Running empty core slots is basically wasting potential.
Prestige cores, on the other hand, are expensive investments. Buying one without understanding how it fits your playstyle can easily waste thousands of credits.
Universal Starter Cores
Some cores work on any runner shell, making them great early purchases while saving credits for runner-specific builds.
Trophy Hunter
Killing a high-value PvE target instantly refills both your tactical and prime ability meters. It’s a simple but effective benefit that activates during normal gameplay.
Close and Personal
Reduces heat generation from melee attacks, which makes aggressive close-range plays more sustainable.
Glass Cannon
When your shields break, ability regeneration speeds up for a short period. This creates a risky but powerful recovery window during intense fights.
The Big Score
Opening locked containers temporarily increases your loot speed, which is extremely useful in areas packed with valuable caches.
These are inexpensive and reliable until you start building specialized loadouts.
Assassin Cores – Stealth and Ambush Builds
The Assassin shell revolves around invisibility abilities like Active Camo, Smoke Cloud, and Shadow Dive.
Most Assassin cores extend stealth uptime or increase damage when attacking from invisibility.
Minus Sights (Prestige)
Holding ADS long enough gradually turns your shell invisible without spending camo charges. This gives Assassin players constant repositioning opportunities.
Shadow Strike (Prestige)
Utility Knife damage increases dramatically when attacking immediately after exiting stealth.
Silent Killer (Prestige)
Backstab attacks while cloaked deal massive bonus damage. This rewards careful positioning rather than quick attacks.
Lower-tier cores support the stealth loop.
Cloak and Dagger expands Smoke Cloud coverage, while Guerrilla accelerates ability recharge inside smoke fields.
When combined correctly, these cores create a stealth cycle that can be extremely difficult for enemies to counter.
Destroyer Cores – The Frontline Tank Build
Destroyer is the opposite of Assassin. Instead of stealth, it focuses on durability and area control.
Its main ability revolves around the Riot Barricade, which absorbs incoming damage.
Counter Attack (Prestige)
Whenever the barricade absorbs damage, it fires homing missiles back at the attacker. Enemy pressure literally turns into retaliation.
Impact Siphons (Prestige)
Damage absorbed by the barricade converts into shield energy for the player.
Reinforced Plating (Prestige)
Increases barricade durability and extends its active duration.
These three cores together create one of the strongest defensive loops in the game.
While building toward them, players often use Adaptive Barrier, which regenerates shields while the barricade is active.
Recon Cores – Information and Map Control
Recon focuses on intel gathering and enemy tracking.
Abilities like Echo Pulse reveal enemies through walls, while Tracker Drone overheats targets.
Recon cores either strengthen information gathering or convert that intel into combat advantage.
Early Warning System (Prestige)
Triggers an automatic HUD alert whenever a hostile runner enters your proximity.
Intuition (Prestige)
Downing an enemy automatically triggers an interrogation effect, revealing additional information.
Echo Chamber (Superior)
Echo Pulse releases additional pulses and returns energy when finishing marked targets.
These cores turn Recon into a constant information engine for the entire squad.
Thief Cores – The Economy Specialist
Thief is the runner designed for loot-focused gameplay.
Its abilities revolve around scanning containers, stealing loot, and escaping quickly.
X-Ray Vision (Prestige)
Highlights containers through walls and automatically reveals the best item inside each one.
Partner in Crime (Prestige)
The Pickpocket Drone automatically pings nearby enemies even when not actively piloted.
Hideout (Superior)
Your physical body turns invisible while piloting the drone.
These cores allow Thief players to navigate the map faster, collect valuable loot efficiently, and avoid unnecessary fights.
Triage Cores – The Ultimate Support Role
Triage runners keep squads alive using Med-Drone, Restoration Field, and revive abilities.
Their cores enhance healing mechanics or add extra utility.
Emergency Response (Prestige)
Casting Restoration Field directly on a downed ally instantly revives them.
This is arguably one of the most impactful cores in team-based play.
Samaritan (Prestige)
Sharing consumables with teammates reduces the cooldown on your Med-Drone.
Combat Medic (Deluxe)
Players standing inside Restoration Field receive damage reduction.
These cores transform Triage from a passive healer into a powerful battlefield support role.
Vandal Cores – High Speed Mobility Builds
Vandal is all about movement, using Microjets, Amplify, and slide mechanics.
Managing heat is the biggest challenge for this runner.
Microjet Efficiency Package (Prestige)
Adds an additional Microjets charge and reduces heat generation.
Adrenal Core (Superior)
Movement abilities produce less heat while Amplify is active, and landing kicks extends Amplify duration.
Extended Amp (Deluxe)
Amplify lasts longer, increasing the window where Vandal’s mobility is strongest.
When combined correctly, these cores allow Vandal players to maintain long movement chains across the map.
Best Core Build Templates by Playstyle
Different runners benefit from specific core combinations.
Stealth Assassin
Minus Sights + Shadow Strike create a powerful stealth-attack loop.
Tank Destroyer
Counter Attack + Impact Siphons turn the barricade into both offense and defense.
Intel Recon
Early Warning System + Pulse Amplifier provide constant map awareness.
Loot Thief
X-Ray Vision + Crime Spree maximize loot efficiency.
Support Triage
Emergency Response + Fresh Install strengthen revive and healing mechanics.
Mobility Vandal
Adrenal Core + Microjet Efficiency Package unlock the full movement potential.
How to Earn and Spend Credits on Cores
Credits are earned by completing contracts, looting containers, and successfully extracting.
Since credits are limited early on, spending them wisely matters.
A practical upgrade order usually looks like this:
First, fill both core slots with Standard cores.
Then move to Enhanced cores that match your playstyle.
Deluxe cores are where builds start becoming meaningful.
Only invest in Superior or Prestige cores once you fully understand how they fit your runner.
Faction contracts from groups like Traxus, MIDA, and Sekiguchi are one of the most reliable credit sources.
The core system is one of the deepest customization mechanics in Marathon.
Weapons determine your firepower, but cores determine your identity on the battlefield.
Two players using the same runner can play completely differently depending on their core setup.
That’s why experimenting with combinations, understanding ability loops, and building toward your preferred playstyle is one of the most rewarding parts of the game.
And with new cores expected every season, the build possibilities are only going to keep growing.