You are able to take the form of a dragon of another bloodline.

Prerequisite(s): Dragon form class feature, 7th-level dragon disciple

Benefit: When you take the shape of a dragon using your dragon form class feature, you are able to become a dragon of any type. However, the duration of the spell is half as long as it normally is.

Normal: Normally you are only able to assume the form of a dragon of your bloodline with the dragon form ability.