Concealing Terrain
This is Terrain that imposes either Partial or Total Concealment against one or more senses (as specified by the specific terrain). Additionally, Concealing Terrain may also include a blocking keyword (effect detailed below) and a distance.
Specified Distance
Some types of concealing terrain only have an effect on perception if the distance between two creatures or objects is greater than or equal to the distance specified. An example of this is fog, where creatures close together can see each other without issue, but those that are far apart have obscured vision.
Non-Blocking Concealing Terrain
Non-blocking Concealing Terrain imposes concealment strictly on things within the terrain.
- Creatures and objects within the terrain have concealment against all creatures (including themselves).
- Creatures and objects outside of the terrain do not have concealment, even if the line of perception passes through to the opposite side of the terrain.
Example: A dark field on a moonless night is considered to be Partial Concealing Terrain (Vision). On one side of the field is a well-lit camp. On the other is a well-lit guard post:
- Creatures and objects within the dark field (outside the radius of the lights) have Partial Concealment (Vision) against all creatures (those within the field, and those outside the field).
- Creatures in the lit camp (outside the terrain) can see each other just fine. Additionally, they can also see creatures in the area of the guard post without difficulty (distance not withstanding). The dark field does not hinder line of sight between between the lit camp and the guard post.
Blocking Concealing Terrain
Blocking concealing terrain works just like Non-Blocking, except that line of perception through the terrain is also hindered.
- Creatures and objects within the terrain have concealment against all creatures (including themselves).
- A creature outside the terrain has concealment from all creatures within the terrain.
- A creature outside the terrain has concealment from all creatures who's line of perception passes through the terrain (such as those creatures on the opposite side).
Example: A spell creates an area of Magical Darkness that is Total Concealing Terrain (Vision, Blocking) in an otherwise well-lit field:
- Any creatures within the Magical Darkness are unable to perceive anything using the visual sense.
- Creatures outside the Magical Darkness can see normally, except when looking into or through the darkness. Not only do the creatures within the Magical Darkness have Total Concealment, but creatures on the other side of the darkness also have Total Concealment. Effectively, the outer edge of the darkness creates a wall of blackness that blocks all sight into and through it.
Creatures affected by Concealing Terrain can still rely on other senses to gain line of perception.