Wall of stone

Wall of stone is an conjuration spell that summons a mutable stone wall.

Effect
This spell creates a wall of rock that merges into adjoining rock surfaces. It is typically employed to close passages, portals, and breaches against opponents. The wall of stone is 1 inch thick per four caster levels and composed of up to one 5-foot square per level. You can double the wall’s area by halving its thickness. The wall cannot be conjured so that it occupies the same space as a creature or another object.

Unlike a wall of iron, you can create a wall of stone in almost any shape you desire. The wall created need not be vertical, nor rest upon any firm foundation; however, it must merge with and be solidly supported by existing stone. It can be used to bridge a chasm, for instance, or as a ramp. For this use, if the span is more than 20 feet, the wall must be arched and buttressed. This requirement reduces the spell’s area by half. Thus, a 20th-level caster can create a span with a surface area of ten 5-foot squares. The wall can be crudely shaped to allow crenellations, battlements, and so forth by likewise reducing the area.

Like any other stone wall, this one can be destroyed by disintegrate or by normal means such as breaking and chipping. Each 5-foot square has 15 hit points per inch of thickness. Creatures can hit the wall automatically, but the wall is so hard that the first 8 points of damage from each blow are ignored. A section of wall whose hit points drop to 0 is breached. If a creature tries to break through the wall with a single attack, the DC for the Strength check is 20 + 2 per inch of thickness.

It is possible, but difficult, to trap mobile opponents within or under a wall of stone, provided the wall is shaped so it can hold the creatures. Creatures avoid entrapment with successful Reflex saves.

Arcane Material Component
A small block of granite.