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Acid orb
sorcerer attack 1

Special: Acid orb can be used as a ranged basic attack.

Target: one creature

Attack: Charisma vs. Reflex

Hit: "1d10 + Charisma modifier acid damage."
Level 21: "2d10 + Charisma modifier acid damage."[PH2:138]

Acid orb is an at-will power available to sorcerers at 1st level.