Well, I honestly thought that "the Astral Plane"was just a layer of the same universe, and thus any paraphysical forces that drives the nature of the spiritual side of our universe could only be accessed by somebody who has universal scale cosmic power over the forces of nature (Universal Force Manipulation: Basically just Cosmological Forces Manipulation on a Universal Scale), but also have the most highest levels of spiritual connection (Absolute Spirituality) to not only access that metaphysical reality, but obtain mastery over it. Combining the abilities allows one to both access the spiritual side and manipulate these celestial forces, possibly even becoming the Lord of the Astral Plane.
In all seriousness though, I think that all you really need to just obtain "Astral Plane Manipulation" (Not Lordship) is to combine Universal Force Manipulation with low or medium level Spernatural Spirituality.