You charge Hamon into a solid, immovable object (such as a wall or door) and attacks an opponent on the other side.
EXP Cost: 3 EXP
Benefit(s): As a standard action and by spending 1 point from your Hamon Pool, you can make a single attack against an opponent on the other side of a wall or doorway by instead striking the doorway. The attack is resolved as if you were within the opponent's reach, although the opponent must still be on the other side of the doorway or wall (effectively making the wall the only blockade between the opponent and you). On a successful hit, the target of the attack is also forcibly pushed 1 square backwards.
In addition to all of this, if the target is an undead they take double damage.