Telas said:
Would brush or small trees inhibit the movement? I commonly use brush as an environmental speed-bump and penalty for missile combat. I ruled that brush slows it down, and may catch fire, depending on recent weather and the DM's dice.
The
sphere seems pretty agile and is spongy and yielding, so I interpret rolling over low obstacles to not inhibit its movement at all. edit: I picture its consistency as something like a not-quite-inflated beach ball or a puffball fungus: close to weightless, and able to squash inwards up to two feet. On second thought, if the brush or low trees are more than 4 feet tall, they should present the same sort of obstacle to the
sphere as they would do to a Medium creature, either reducing it to half speed or preventing it moving through.
Brush or trees ignite when touched unless they are sufficiently damp not to consider them flammable.
On the original questions, nothing states that the
sphere must form on a solid surface. If cast in midair it falls to the ground, not counting the fall as movement and not taking or causing any falling damage.
The
sphere can roll up stairs.
You raise an interesting question about mud, and by extension water. I see nothing to indicate that it must roll on the
ground as opposed to another surface, and it has tallow as a material component. I think the
sphere would roll over mud or water like solid ground.
