This may be inscribed around a summoning circle.

Binding 150 [180] 
    Unbreakable [+40%] 
    Area Effect (4 yard radius) [+100%] 
    Variable (Allows size reduction) [+5%] 
    Triggered Delay (Summoned being entering circle) [+50%] 
    Environmental [-40%] 
        Must be within 1 yard of surface 
        Must be inside circle 
    Terminal Condition (Common knowledge) [-20%] 
        Can be disrupted by marring the circle externally 
    One-Shot [-10%] 
    Preparation Required (1 hour) [-40%] 
        Drawing the binding circle 
        May be re-used [-20%] 
    Preparation Requires Skill Roll (Symbol Drawing) [-5%] 
    Takes Extra Time 13 [-90%] 
    Magical [-10%] 
    Spell Components [-20%] 
        Must chant in Latin 
        Must gesture with hands 
Levels 2-14 [210/240/270/300/330/360/390/420/450/480/510/540/570] 
    Reduce Takes Extra Time by 1 level [+10%]