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In a practical sense you would assume a Godform in order to work with a specific energy or purpose typically associated with that God. For instance if you were doing a working to protect a home or family, you might assume the Godform of Bastet for the purpose of the ritual, in order to channel her protective energies into your working and add a little bit of extra kick. Likewise you might assume the Godform of Loki if you are doing some sort of confusion or crossing, or Jupiter for wealth or empowerment.
The actual process of creating a Godform differs depending on what source you are using. For the sake of simplicity I am going to boil everything down into the prim