Quote Originally Posted by ThePurple View Post
The exact wording of the power is "You learn the general layout of terrain features in the burst. You cannot sense through solid objects, such as cave walls, but you do sense around corners and into narrow gaps. Additionally, you can make a Perception check to detect hidden creatures, objects, and traps as though you were within 10 squares of them."

This breaks down into 2 different parts. The first part refers specifically to "general layout of terrain features", so it only allows you to know the location of terrain and the like. It *does* specifically say that it won't allow you to sense through solid objects while allowing you to sense around corners and into narrow gaps. For this, I would just rule that the effect follows the normal rules for blocking bursts and blasts, with total cover preventing sensation (solid objects) but superior cover and normal cover allowing for it (corners and into narrow gaps).

The second part is simply an extension of the normal use for detecting hidden creatures via Perception. The "within 10 squares of them" is simply a proviso that notes that the DC for the Perception check won't be any higher than normal (normally, 10+ spaces away increases DC by 2). Assuming you roll high enough on Perception, you'll know what spaces are occupied by creatures, traps, and other objects, but you won't be able to actually see and know what they are (as normal for finding a hidden creature without special senses).

To specifically answer your questions, you can see the layout but you have to roll Perception to detect creatures and, even then, you're only able to know what spaces they're in rather than actually being able to see the creatures. Furthermore, the powers effects extend through doors without perfect seals because they are not total cover (I might even allow it through all doors, in fact, since they're not "solid" by definition).
Thank you so much for the prompt reply! That all makes sense, just one further quick question. Would you have the players make just one single perception roll to determine all creatures, even if there are 8+ rooms with them? Or would you have them make a roll in each room? It worked out ok with my on the fly ruling. The players needed some help finding Blink, the one-eyed goblin in Fall of the Grey Veil, who was hiding in the cistern. Though I did also inform them of several other creatures, and their type. It didn't break down, because the combats were still challenging for them.

The heavy oak doors I allowed the Cave Sight through, the secret doors I did not, unless she had rolled higher than the DC21 for them, which she did not. She rolled a single DC18 perception. Anyway, this also begs the question, if doors are not ruled as total cover for the purpose of spells...Than wouldn't that potentially open a can of worms for the players in the future? Many spells simply needing line of effect could be cast to go under doors? Would this be true? And if so, should I present the two options to my players to determine how they want to go forward with the ruling on doors?