TYPICAL THICKNESS	BREAK DC	HARDNESS	HIT POINTS*	CLIMB DC
Masonry	1 ft.	35	8	90 hp	20
Hewn stone	3 ft.	50	8	540 hp	25
Unworked stone	5 ft.	65	8	900 hp	15
Paper	Paper-thin	1	0	1 hp	30
Iron	3 in.	30	10	90 hp	25
Wooden	6 in.	20	5	60 hp	21

 * Per 10-foot-by-10 foot section.

Walls are the most common obstacle in a dungeon, steering monsters and adventurers with sturdy stone. There are several kinds of common dungeon walls.

MASONRY WALLS

The most common kind of dungeon wall, masonry walls are usually at least 1 foot thick. They stop all but the loudest noises. It takes a DC 20 Climb check to climb a masonry wall. 

HEWN STONE WALLS

Hewn stone walls are created when a chamber or passage is tunneled out from solid rock. The rough surface of a hewn wall frequently provides minuscule ledges where fungus grows and fissures where vermin, bats, and subterranean snakes live. When such a wall has an “other side” (meaning it separates two chambers in the dungeon), the wall is usually at least 3 feet thick; anything thinner risks collapsing from the weight of all the stone overhead. It takes a DC 25 Climb check to climb a hewn stone wall.

UNWORKED STONE WALLS

Unworked stone walls are uneven and rarely flat. They are smooth to the touch but filled with tiny holes, hidden alcoves, and ledges at various heights. They’re also usually wet or at least damp, since it’s water that most frequently creates natural caves. When such a wall has an “other side,” the wall is usually at least 5 feet thick. It takes a DC 15 Climb check to climb an unworked stone wall. 

PAPER WALLS

Paper walls are placed as screens to block line of sight, but nothing more.

IRON WALLS

Iron walls are placed within dungeons around important places, such as vaults.

WOODEN WALLS

Wooden walls often exist as recent additions to older dungeons, used to create animal pens, storage bins, and temporary structures, or just to make a number of smaller rooms out of a larger one. Wooden walls may be free-standing or attached to stone walls with iron spikes.