Dragon Ally, Greater(Draconomicon, p. 111)
Level: Sorcerer 9, Wizard 9,
Components: V, XP,
Casting Time: 10 minutes
Range: Close (25 ft. + 5 ft./2 levels)
Effect: Up to three summoned dragons, totaling no more than 27 HD, no two of which can be more than 30 ft. apart when they appear
Saving Throw: None
Spell Resistance: No
As lesser dragon ally, except you may summon a single dragon of up to 27 HD or up to three dragons of the same kind whose HD total no more than 27. The dragons agree to help you and request your return payment together.
XP Cost: 500 XP.