How to use the Observation Deck Key in Night Marsh - Marathon Guide @GeekyPastimes

How to use the Observation Deck Key in Night Marsh - Marathon Guide @GeekyPastimes

Uploaded June 2026 | Updated September 2026, 2 weeks ago

Found the Observation Key on Marathon Night Marsh? Here's how to use it to fight the secret boss and get to the best loot room on the map!

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How to use the Observation Deck Key in Night Marsh - Marathon Guide

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How to use the Observation Deck Key in Night Marsh - Marathon Guide