The section detailing the arrow slits and murder allows in the Gatehouse got me really perplexed.
Arrow Slits and Murder Holes: These apertures provide superior cover to creatures on either side of them.
Cover to creatures on both sides of them? What? That would make using them completely useless! If both the attackers and the defenders get the cover, then what have we achieved here?
However, they allow attacks to be made only in the two squares adjacent to them
What? I reread this sentence countless times, and still cannot understand what its meaning is. Which adjacent 2 squares? Does it mean that behind an arrow slit a defender can only attack those in just 2 squares that are adjacent to the arrow slit? Again, that would make the arrow slit completely useless!
A creature standing in a square adjacent to the wall 5 feet or more from an arrow slit cannot be seen by anyone on the other side.
Adjacent to a wall? What about squares not adjacent to a wall? Why does being adjacent to a wall have to do anything with this at all?