Lesser Paraelemental of Silt

Second edition AD&D failed to make paraelementals for Dark Sun, so I will be creating some. I've decided to start with the lesser paraelementals and eventually get to the greater paraelementals.
However, I'm going to begin with the lesser paraelemental of silt. Feedback is welcome.

Prepare to cough a lot.

Stats after the jump.



Lesser Silt Paraelemental

Climate/Terrain: Any Silt
Frequency: Rare
Organization: Solitary
Activity Cycle: Any
Diet: Silt
Intelligence: Low (5-7)
Treasure: Nil
Alignment: Neutral
No. Appearing: 1
Armor Class: 4
Movement: 12
Hit Dice: 2, 4, or 6
Thac0: 2 Hit Dice: 19
            4 Hit Dice: 17
            6 Hit Dice: 15
No. of Attacks: 1
Damage/Attacks: 2 Hit Dice: 1-8
                             4 Hit Dice: 2-16
                             6 Hit Dice: 3-24
Special Attack: See Below
Special Defense:+1 or better weapon to hit
Magic Resistance: Nil
Size: S-M (2'-6') Height = HD
Morale: 2 HD: Steady (11-12)
             4 - 6 HD: Elite (13-14)
XP Value: 2 Hit Dice: 420
                 4 Hit Dice: 650
                 6 Hit Dice: 975

Lesser Silt Paraelemental
The lesser silt paraelemental appears as a vaguely humanoid shape formed entirely out of silt. It has no features and seems to enjoy others reactions to its alien appearance. It has no legs, but rather rolls on a body of loose silt.
Combat: The lesser silt paraelemental can travel freely through silt and loose sand. The monster can transform its body into a raging silt storm with a radius of 10 feet. Those caught within the storm must make a successful saving throw versus rod/staff/wand or become blinded for 1d4 rounds. However, nothing can save them from the storm’s physical battering, which causes 1d2 points of damage per Hit Die of the paraelemental.
The lesser silt elemental does not fight magma or waterborne creatures very effectively. All damage inflicted against opponents in magma or in water is halved.