Natural Form[]
The way you look when you normally astral project is your Natural Form.
Special Form / Transformation[]
When you enter a Domain and you appear different in the Domain than your Natural Form. Not many have a Transformation, those who do can normally transform at any time within a Domain by using a trigger word. By talking with the Guardian of your Domain you can learn whether or not you have a Special Form as well as your trigger form. Special Forms normally appear older than your Natural Form and are armed with special weapons unique to your Transformation.