SRD:Dragon Knight

This spell summons an adult red dragon. It appears where the character designates and acts immediately. It attacks the character’s opponents to the best of its abilities (on the first round, it prefers to breathe fire on an enemy, if possible). The character can direct the dragon not to attack, to attack particular enemies, or to perform other actions. This is a ritual spell requiring two other spellcasters, each of which must contribute an unused 8th-level spell slot to the casting.