Superb Dispelling

Abjuration

Spellcraft DC: 59
Components: V, S
Casting Time: 1 standard action
Range: 300 ft.
Target: One creature or object
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No
To Develop: 531,000 gp; 11 days; 21,240 XP. Seed: dispel (DC 19). Factors: additional +30 to dispel check (+30 DC), 1-action casting time (+20 DC). Mitigating factor: 10d6 backlash (-10 DC).

As greater dispel magic, except that the maximum bonus on the dispel check is +40, and the character takes 10d6 points of backlash damage.