Uploaded July 2026 | Updated September 2026, 2 weeks ago

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Challenge World 4 comes with a special exclusive season boss: Maerin, the Guide of Destiny! This boss has a special mechanic where every time you fill up the gauge, you can choose one of three skills from other jobs to use! Furthermore, use the correct classes' skills and you'll unlock an additional random power that can include resetting all of your skills!
More information: orangemushroom.net/2026/07/04/kms-ver-1-2-416-maplestory-overdrive-ruler-of-covenants-lethe/#event2

0:00 Preparation
0:20 Phase 1
10:37 Phase 2
21:25 Reward Room

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