Siege Walls

These old walls are all that is left of a great city, torn apart by internal strife. In the end, the fortifications were used to hold the vast foment of rebellion inside the city.
Benefit: Once per 5 [Rounds] as a standard action, you may create a wall of bones within [Medium] range. This wall consists of a number of 5 ft square sections equal to your character level with each section adjacent to another section. Each section of the wall is an obstacle and has 50 HP. Each section may be treated as a creature for the purposes of targeting with attacks and effects that deal damage and for the purposes of area effects that deal damage. Each section cannot make saving throws and is hit by any attacks targeting it. If an effect would damage a section on the section's turn, it is damaged on your turn. Once a wall section reaches 0 or fewer hit points, it is destroyed. The wall may not be placed in such a way that it occupies the same space as a creature, mount, or another object.