The text for Stinking Cloud says
Effect: The burst creates a zone of poisonous vapor that blocks line of sight until the end of your next turn....
Does that mean that even at the inside edge of a Stinking Cloud creatures have total concealment?
Can a creature on the inside edge make an opportunity attack against a creature on the outside edge or vice versa?
Can a creature in a Stinking Cloud make an opportunity attack at all, unless they have some sort of special vision?
Does a creature on the inside have partial or total concealment from someone on the outside edge of the Stinking Cloud ?