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The rules on this page apply to solid wall defenses which includes:
Other solid structure defenses such as Slab and Stone Armor have their own rules. Walls that are not solid, such as Wall of Air and Wall of Fire also have separate rules.
Attacks that would intersect the wall automatically hit the wall, therefore an attack roll is not yet necessary. Instead, roll damage. Each hex of wall (segment) has the amount of hit points rolled when the wall is created. Damage to each segment of wall is persistent, and if the total damage dealt exceeds the segment's hit points, the segment is destroyed. Excess damage continues along the original trajectory. If it intersects another segment of wall the excess damage is dealt to the next wall segment.
If an attack breaks through wall segments and makes it to a target creature, then resolve the attack roll. If the attack hits, whatever damage was not absorbed by a wall is applied to the creature.
