Control (Spell Damage) can control a specific spell up to 10 times level squared points, increasing or decreasing damage inflicted by 10% per level.

Control (Spell Damage, Occasional) 1 [29] 
    Persistent [+40%] 
    Extended Duration (Permanent) [+150%] 
        Applies to Persistent 
    Extended Duration (x3) [+20%] 
        Applies to how long the caster has the ability 
    Reduced Time 1 [+20%] 
        Free action to affect spells, but doesn't apply to casting time 
    Only to Increase Damage [-50%] 
    Can Only Affect the Caster's Spells as They're Cast [-50%] 
    Magical [-10%] 
    Spell Components [-30%] 
        Must say "damage" in Latin 
        Must gesture with hands 
        Must hold two different sized bronze or silver rings 
Level 2 [57] 
    Increase Control by 1 level [+15 base] 
Levels 3+ [+28.5/level] 
    Increase Control by 1 level [+15 base]