“The lake presumed a form or three
Of water-logged anatomy—
No longer spar, nor root, nor bone
But purpose risen, 'pon its own”
FAQ (1)
How does this ability work?
Allies which are nearby to the Marrows, including themselves, can't be forcibly submerged, e.g. Atlantean Fate, Drown, Call of the Sea, etc. Nearby allies can still choose to submerge when taking their own steps via their own submergeability.