Musrum said:But StealthyMark states you can't use Fly Speed underwater, why then can you use Land Speed? And no, a common sense answer is obviously not good enough...
Pg 92 of the DMG (Table 3-22) says that you when you have Firm Footing you have half your movement (basically it costs twice as much movment points per square as normal) and the note 3 states:
Creatures have firm footing when walking along the bottom, braced against a ship’s hull, or the like. A creature can only walk along the bottom if it wears or carries enough gear to weigh itself down—at least 16 pounds for Medium creatures, twice that for each size category larger than Medium, and half that for each size category smaller than Medium.
So, yes you can "walk" on the bottom of the river or other body of water.
Can you use a swim speed for flying?
How about a burrowing speed?
Essentially that is what is being proposed - to allow alternate movement types in other "terrains".
Can you use swim, burrow or fly speeds when levitating? If so which ones?