There's no RAW at all on this. RAW just says that it takes a bonus action, which means your PC is acting in some way. It doesn't say whether it's thought alone, verbal, somatic, verbal and somatic, wiggle your tush or whatever. The DM would be the one to decide what exactly the PC is doing when he uses his bonus action to move the sphere.If I am hidden can I keep running my flaming sphere into people without exposing myself? It is not an attack, and it is not casting a spell, so I think RAW I am good.
That's certainly one valid way to rule it.You know that scene in Harry Potter where Hermione thinks Snape is cursing Harry's broom.
Actually casting the spell is obvious to anyone in the vicinity, but merely directing the spell from a hidden place only requires concentration. If you are hidden, you don't get less hidden. IF you aren't hidden except by a crowd such as at a Quidditch tournament, it requires a Sense Motive check to figure out who is subtly concentrating on an existing spell with a difficulty determined by the crowd size and proximity to the caster.
I'm sure you have your view but, on the basis of the description:Can you move the sphere to a location you cannot see/don't have a line of sight to?
I agree there is not in the spell description but unsure how this interacts with general spell rules.there doesn't seem to be a dependence on sight
In 5e objects are not creatures, and creatures are not objects, so this does not automatically follow. The sphere is not solid.If you ram the sphere into a creature, that creature must make the saving throw against the sphere's damage, and the sphere stops moving this turn" so, I'd expect that the same would apply to solid objects.
I would interpret this as being blocked by any barriers over 5 ft. tall, and any pits greater than 10 ft. wide. It doesn't fall in, it just stops.... you can direct it over barriers up to 5 feet tall and jump it across pits up to 10 feet wide.