My DM seems to think that Darkvision negates the ability for a Shadowdancer to use Hide in Plain Sight because in stealth you are required to either have cover or concealment. He is consistent on the fact that one or the other are required to use stealth unless SPECIFICALLY stated otherwise, in which case it doesn't for shadowdancers. It instead says you do not need cover, can hide while being observed, yet he still insists I need concealment from darkvision.
My DM is incredibly thick. I have used quotes and the like straight form the book yet this is what I still get back from him:
"Hide in Plain Sight (Su): A shadowdancer can use the Stealth skill even while being observed. As long as she is within 10 feet of an area of dim light, a shadowdancer can hide herself from view in the open without anything to actually hide behind. She cannot, however, hide in her own shadow.
Here is what you are talking about. Note that it still says even while being observed….as long as you are within 10 feet area of dim light (ie shadows, darkness, CONCEALMENT). The next part is very important. There is a subtle distinction that you are missing. “Hide behind” means to use cover to hide. It says right in the Stealth skill that you can use cover or concealment. This is just saying that the Shadowdancer needs only a bit of shadow to CONCEAL themselves.
Copied and pasted from Pathfinder Core Rulebook Stealth skill:
If people are observing you using any of their senses (but typically sight), you can’t use Stealth. Against most creatures, finding cover or concealment allows you to use Stealth. If your observers are momentarily distracted (such as by a Bluff check), you can attempt to use Stealth. While the others turn their attention from you, you can attempt a Stealth check if you can get to an unobserved place of some kind. This check, however, is made at a –10 penalty because you have to move fast.
Above is the reference to concealment and the Stealth skill.
Copied and pasted from Pathfinder Core Rulebook page 197
Concealment and Stealth Checks: You can use concealment to make a Stealth check. Without concealment, you usually need cover to make a Stealth check.
Ignoring Concealment: Concealment isn’t always effective. An area of dim lighting or darkness doesn’t provide any concealment against an opponent with darkvision.
This means that you must always have either concealment or cover to use Stealth. If you are using shadows and/or darkness as concealment then it is not effective against opponents with Darkvision.
If you don’t use either of these then it’s not stealth, it’s invisibility."
Now, are there any suggestions as to what I can do in order to get this guy to come back to reality? I'd really like to not have to leave my group because of him and this ordeal.