Fantasy Monster: Sliming Desert

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Sliming Desert

A mound of sand slowly slithers leaving behind only dried ground and dust.

CR 12; XP 19,200
N Colossal Ooze

Init –5; Senses termorsense 300 ft.; Perception +0

Defense
AC 17, touch –3, flat-footed 17 (–5 Dex, +20 natural, –8 size)
hp 304 (32d8+160); fast healing 10
Fort +23; Ref +5; Will +10

Defensive Abilities ; Immune ooze traits

Offense
Speed 15 ft., burrow 10 ft.

Melee 4 slams +21 (2d6+5 plus suck-in)

Space 30 ft.; Reach 10 ft.

Special Attacks boundless sands, crushing desiccation (6d6 plus 6d6), suck-in

Statistics
Str 20, Dex 1, Con 20, Int –, Wis 11, Cha 1
Base Atk +24; CMB +37; CMD 42 (can't be tripped or forcibly moved)

Skills Perception +0, Stealth +4; Racial Modifier +20 Stealth

SQ trail of dust

Ecology
Environment borders of deserts
Organization solitary
Treasure standard

Special Abilities

Boundless Sands (Ex) A sliming desert can make an unlimited number of attacks of opportunity each round, one per triggering event.

Crushing Desiccation (Ex) A corporeal creature underneath the sliming desert suffers 6d6 points of damage from desiccation and 6d6 points from crushing at the start of its turn until it escapes.

Suck-In (Ex) Any Large or smaller corporeal creature hit by sliming desert's slam attack has to make a Reflex saving throw (DC 21) or becomes pulled underneath the sliming desert, and pinned by its mass. The saving throw DC is Dexterity-based.

Trail Of Dust (Ex) A sliming desert leaves only dried ground, sand, and dead, desiccated vegetation in its wake, destroying any vegetation and minor life forms that aren't magically protected.

A sliming desert is  a massive living dune, composed of uncountable number of minute spores,  made of slime-covered sand grains. It moves around drawing any traces of moisture from plants, animals, and the ground itself.