Dragon Ally

(Spell Compendium, page 72, DnD 3.5)

Conjuration (Calling)

Level: ; Sorcerer/Wizard 7; , Dragon 7
Components: V, XP
Casting Time: 10 minutes
Range: Close (25 ft. + 5 ft./2 levels)
Effect: One called dragon of 18 HD or less
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No

This spell functions like lesser dragon ally, except you can call a single dragon of up to 18 HD.

XP Cost: 250 XP