Editing DnD Desert Raiders Campaign Natural Hazards (section)

==== Sand Travel ====
Fields of deep sand can impede the movement of creatures that cannot fly, float, or otherwise stay off the ground when traveling. Most creatures do not automatically sink all the way into deep sand. A hard crust of dried mud or salt can make the surface hard enough to support some weight. Sand that has been stabilized by desert growth is generally safe to walk on.
The following new terrain features are provided ro supplement those found under Desert Terrain on page 91 of the Dungeon Master’s Guide.
Shallow Sand: Shallow sand is much more common in desert areas than deep sand. Areas covered by this terrain feature have a layer of loose sand about 1 foot deep. It costs 2 squares of movement co move into a square with shallow sand, and the DC of Tumble checks in such a square increases by 2.
Deep Sand: Deep sand is most often found in deep deserts near areas of rolling dunes and fierce storms. Many creatures unfamiliar with desert terrain mistake deep sand for quicksand, although deep sand is not nearly as deadly. Areas covered by this terrain feature have a layer of loose sand up to 3 feet deep. It costs Medium or larger creatures 3 squares of movement to move into a square with deep sand. It costs Small or smaller creatures 4 squares of movement to move into a square with deep sand. Tumbling is impossible in deep sand.
Sand Crust: A sand crust appears as normal solid ground. Usually formed from a hardened crust of dried mud or salt, sand crusts sometimes cover areas of shallow sand (or, very rarely, deep sand). If a creature weighing more than 100 pounds (including equipment carried) enters a square covered with a sand crust, it breaks through to the sand below. The creature treats the square as shallow sand or deep sand, whichever lies below that square of sand crust, and it must deal with the effects of the sand on movement as described above. Creatures moving through an area of sand crust leave a trail in their wake, turning the sand cruse they pass through into shallow sand or deep sand squares as applicable. Creatures weighing 100 pounds or less can treat sand crust as normal terrain.