The sephirot of the Yetzirah, the Third World, do the work of creation. They are Netzach, Hod, and Yesod - Endurance, Glory, and Foundation.
Netzach is associated with the Solar Plexus chakra. It is will, endurance, the drive to accomplish something.
Hod represents Glory or Victory. It is desire, associated with the Sacral chakra.
Yesod actually creates or builds the Foundation on which our creation will manifest. That foundation, and the building of it, are associated with the Root chakra.
Working with the correspondences of these sephirot in ritual or meditation helps you to connect with the actual work involved in manifesting a magical desire.
