Nineteen Calls, Thirty Aethyrs

The Claves Angelicae, or Enochian Keys, are recitations in the Enochian language, each given with Dee's own English gloss, that function as the liturgical mechanism for working with the wider Aethyr system. Rather than writing thirty separate calls for thirty Aethyrs, Dee's system uses eighteen of the nineteen Keys across all thirty regions through a substitution method: repeating a given Key while changing certain governing names within its text according to fixed tables lets the same recited structure open a different Aethyr each time it is used with different substituted names, an economical design that lets a comparatively small fixed liturgy reach a much larger structure of spiritual regions.

The nineteenth and final Key stands apart from this pattern, addressed instead directly to the four Watchtowers of the Great Table rather than to any single Aethyr, closing the set by turning from the vertical structure of ascent through the Aethyrs to the horizontal, elemental structure the Watchtowers represent. Together the nineteen Keys function as the working liturgy binding the system's two major structural halves, the graded Aethyrs and the elemental Watchtowers, into a single practice rather than leaving them as two unconnected diagrams.