The final authority of a Deity was the Mode of Bestowal. Basically, this was the channel that connected the Deity to the Believers, whether in terms of prayers or giving a blessing.
The Mode of Bestowal was typically nature aligned. If a Deity's Mode of Bestowal was through the earth, then all a believer had to do was create the Deity's symbol using the earth to pray or request a blessing.
And the blessing would be bestowed upon him through that symbol made of earth. This Mode of Bestowal was by far the most important authority of a Deity.
After all, if a Deity's Mode of Bestowal was water, if the believer was stranded in a desert or a region with no water, the blessings would never reach him. Similarly, even if he possessed a symbol of the deity, it would be impossible to make contact.
In such cases, they would typically have symbols made out of wood or stone that they would immerse in water to offer prayers.