Zompist Bboard Again

If using Verdurian to render the name of a past event that means something like "The Casting (of Stones)" -- in roughly analogous fashion to "The Fronde" in French history -- how does the declension of the definite article work and what form should the verb "arelir" take? Having trouble working this out from the morphological sources on the site.

The noun would be ařelia (feminine). So "The casting of stones" is soa ařelia ďumië.

Many thanks!