Sentinel Mastery
Rewards
Each option is one Mastery challenge with its own price, and you get the challenges you select. One challenge does not complete Sentinel Mastery: to finish the whole Sentinel set, select all five.
- The Not So Fast Mastery challenge, with Not So Fast
- The Impenetrable Mastery challenge, with Impenetrable
- The Riposte Mastery challenge, with Riposte
- The Posted Up Mastery challenge, with Posted Up
- The Information Economy Mastery challenge, with Information Economy
Description
Sentinel is the Runner shell Marathon added in Season 2, "built for controlling space and defending areas". It is the shell that protects a crew through a clutch final exfil or turns a fight against a team rushing you down.
Sentinel's kit
- Defender System. The Prime ability: an automated laser platform that destroys incoming enemy grenades and missiles and boosts weapon handling for nearby crewmates. Its charges run out, so it can't block every barrage.
- Snare Mine. The tactical: a thrown proximity mine that bursts into Immobilizing submunitions and locks enemies in place.
- Castle Doctrine. The passive: more resistance after splash damage, and faster handling for close-range weapons when you are surrounded.
Mastery in the Codex
Each Runner shell has its own Mastery challenges in the Codex, Marathon's record of achievements and narrative discoveries, and Codex progress earns exclusive cosmetics and lore. Sentinel's set is built around that defensive kit: Not So Fast, Impenetrable, Riposte, Posted Up and Information Economy.
Pairs well with Destroyer Mastery and Triage Mastery.
How does the service work
CarrySquad’s services are designed to help players efficiently complete in-game feats, earn rewards, and progress faster without the grind. Once you place an order, you receive access to a personal Service Dashboard and a notification link via email.
A specialized coach is quickly assigned to your order and communicates directly with you through the dashboard chat. Your coach will play alongside you in your squad, helping you achieve your requested objectives while sharing professional tactics and insights. All sessions are completed 100% by hand, without any bots or cheats, and progress updates are provided in real time.
Key steps in the CarrySquad service workflow:
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Coach Matching: After ordering, you’re matched with a professional coach who joins your Dashboard chat to coordinate the session.
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Joint Execution: Your coach assists you in reaching your goals—whether it’s completing difficult feats, unlocking exclusive rewards, or reaching character, account, or activity progression goals through collaborative play.
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Flexible Scheduling: The coach coordinates with your preferred playing schedule to ensure sessions happen when it’s most convenient for you.
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Instant Notification: You’re notified immediately upon reaching your objectives through both the Dashboard and email.
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Maximum Security: Your account remains entirely in your hands. Our service is focused on safe, professional guidance, and customer support is always available for any questions.
CarrySquad services are tailored for efficient, safe, and hands-on progress—helping players clear difficult feats, earn exclusive items, and enhance their in-game reputation with professional coaching tailored to the objective you selected.
Requirements
- Marathon on Steam, PlayStation 5 or Xbox Series X|S
- The Sentinel Runner shell
- Account access (not needed with Play with our team)
If you have questions
Feel free to ask any questions in our chat. We are glad to help you, and our Squad will always find you the best service and the deadliest gun for your Guardian!
