Your attack creates a sandstorm around the foe, shredding its flesh until it escapes.

Encounter   ✦     Primal, Weapon
Standard Action      Melee or Ranged weapon

Target: One creature

Attack: Primary ability vs. AC

Hit: 1[W] + ability modifier damage. If the target doesn't move at least 2 squares during its next turn, it takes extra damage equal to 5 + your primary ability modifier at the end of its turn.

Level 17:

  Hit: As above, but 2[W] + ability modifier damage.

Level 27:

  Hit: As above, but 3[W] + ability modifier damage.

Published in Dark Sun Campaign Setting, page(s) 71.