You have learned to harness the powers of your blue dragon ancestry and can hurl orbs of lightning.
Prerequisite: Draconic Heritage (blue), sorcerer level 3rd.
Benefit: As a standard action, you can convert an arcane spell slot into a number of orbs of lightning equal to the spell’s level, which immediately fly toward the targets you designate. Each orb has a range of 30 feet and requires a ranged touch attack to hit. On a successful hit, each orb deals a number of points of electricity damage equal to 1d6 + your Cha modifier. You can direct any number of orbs at any target within range, all of them at the same target if desired.
Source: Dragon Magic, page 15.