This turns the ground under the target's feet into a big hand that reaches out to grab their legs and hold them in place. The hand has a DR of 4.

Binding 12 [40] 
    Malediction (Speed/Range Table) [+150%] 
    Based on Activation Roll [+5%] 
    Resisted by DX [+20%] 
    Maximum Duration (10 minutes) [-50%] 
    Environmental (Dirt Ground/Floor Under Target, Occasional) [-20%] 
    Magical [-10%] 
    Spell Components [-30%] 
        Must say "earth" in Latin 
        Must gesture with hands 
        Must hold a miniature hand sculpted from clay ($3) 
Levels 2-7 [50/60/70/80/90/99] 
    Increase binding by 3 levels [+6 base] 
Levels 8+ [+9.9/level] 
    Increase binding by 3 levels [+6 base]