Lavender's Scintillating Sphere (+1 CL from Energy Affinity, +1 CL from Storm Bolt, +2 CL from Storm Spell Power for a grand total of 10.) Reflex save is DC 16, unless I missed something.

Damage: (10d6)[44]

Reflex:

(1d20+4)[12]

(1d20+4)[10]

(1d20+4)[17]

(1d20+8)[19]

(1d20+8)[14]

(1d20+8)[21]

Ranged Attacks:

(1d20+4)[7]
(1d8+2)[10]

(1d20+4)[12]
(1d8+2)[3]

(1d20+4)[22]
(1d8+2)[9]