Thanks to early historical dominance by the Church of Hormus and later Zoher Zoherian is the primary language spoken across the continent. Even some of the native Girav gel people know enough to get by. It is also the dominant script used for putting language to paper, and many of the later alphabets to come along take wholesale or at least in part from their system of letters. The Rugadh Sliabh are one of the only major deviations in this utilizing their own, far more ancient set of glyphs.
History and Evolution
The original logography Zoherian eventually spiraled off from was based upon the Forms which were said to have been developed at the same time by Oskari Honkala. Over time the Forms and the Zoherian logography, known then as the Shapes, diverged in their changes and evolutions.