WanderingMystic
Hero
1: As you attempt to hide you notice that the level of light is just too much to conceal you, you think that unless you were to have some outside assistance like a spell or device there is no way you are going to be able to hide. (Every table I have played in has not let a pc attempt a failed check unless something has changed, or significant time has passed. Someone causes a distraction is the most common I have seen for a hide check
2: yes, and why is that a problem.
3: After spending a few moments assessing the area you can't seem to find the right conditions to hide in.
the dc 15 is to gain the invisible condition which I do believe allows the rogue to move out from cover and not begin seen.
I also believe that the dm should/will give bonuses to the guard's passive perception if the rogue is not trying to be sneaky at all (dancing in front of the guard) but if they are like "im moving out from cover and sneak attacking the guard or i am moving out of cover but sticking to what little shadows there are to sneak around the guards" is perfectly reasonable and why they give them the invisible condition.
2: yes, and why is that a problem.
3: After spending a few moments assessing the area you can't seem to find the right conditions to hide in.
the dc 15 is to gain the invisible condition which I do believe allows the rogue to move out from cover and not begin seen.
I also believe that the dm should/will give bonuses to the guard's passive perception if the rogue is not trying to be sneaky at all (dancing in front of the guard) but if they are like "im moving out from cover and sneak attacking the guard or i am moving out of cover but sticking to what little shadows there are to sneak around the guards" is perfectly reasonable and why they give them the invisible condition.