Caliban said:
While that's certainly a reasonable interpretation, it's not the only possible interpretation, and it's certainly not much fun.
The spell is nearly useless as written, so I allow a slightly more flexible interpretation. It's certainly not overpowered, as I haven't seen any sudden rush to use the spell.
It is nearly useless as a combat spell. As a spell to carry a severely wounded comrade or to carry treasure, especially in "dungeon-like settings" where beasts of burden can rarely go, it is nearly indispensable.
I think that most objective people who read the description of Floating Disc would agree that it refers to a disc that performs two tasks: following the caster and carrying a load.
Is it unbalanced to allow the caster to use it as a form of mount/attack platform. Probably. It is only a first level spell and as such, allowing the caster to move without getting fatigued, without setting off some forms of traps, without leaving tracks, etc. for hours on end may be a little much when compared to pass without trace, levitate, and fly spells. No movement spell below that of Fly allows semi-convenient movement through a swamp.
Is it a house rule? Yes. Designer intent seems fairly clear on this one.
Giving the disc nearly the equivalent of the Pass Without Trace ability, a low powered version of flight, the ability to avoid pit traps, and the ability to avoid fatigue on a long march (in addition to its other normal abilities) makes the spell too uber. IMO.
Caliban said:
You're the first person I've seen claim that the Fly spell wouldn't operate underwater.
Always a first time for everything.
Caliban said:
You have a magical means of propulsion that doesn't require any moving parts (wings, engines, etc), so why wouldn't it work underwater? After all, water is just a slightly thicker medium than air, and it's not as if you are using wings to fly.
Since I can't see any logical reason why it wouldn't work in the game world, I just ruled that you fly at 1/2 speed due to water resistance.
With regard to flying, I doubt you will find any dictionary definition that does not include movement through the air. I also doubt you will find any dictionary definition that includes movement through water.
Flying (and the Monster Manual reference to Flight) quite frankly refers to moving through air. Ask any person you know what the word flying means and it is very unlikely that they will ever talk about moving through water since the word does not mean that.
Even the phrase from the Fly spell "is still aloft" does not make sense underwater. And the concept of "floats downward at 60 feet per round" makes no sense in the context of being in water and not being burdened to the point of sinking.
Now, we do have a slang expression of "flying" to mean that something is moving fast (e.g. that shark is flying through the water), but that is hardly a reason to think that the Fly spell gives you that ability.
Is it unbalanced to allow movement through water. No. Is it a house rule? Yes.