If I cast a wall over the passage between two adjacent sectors and someone plays rotate sector, what happens to the wall? Does it stay? Move with the sector? Become 2 walls? Love this game. Hope they have another expansion up to 6 player.

The wall is destroyed (pretty sure it should be buried somewhere in the rulebook)

hope this helps!

rotate sector nullify effect that affect walls such as wall created near 2 sector border line and cracks on adjacent border line's walls.