Gabranth implied last patch he plans to summon her as a Primal against the empire. I'm betting on it being Asura.
Also from notes you can get about notable members of the IVth Legion. Specifically from the notes about Clarricie quo Priscus:
There is a nomadic group in Ilsabard called the Eschva. Clarricie specifically is an Elezen, so it's either an Elzen group or a multiracial group. They were conquered by Garlemald 10 years ago, but refusing to settle, Gabranth gave them a compromise: they can continue to be nomads as long as they send their strongest men to serve in the army. Clarricie's husband was one but died on his first mission, so Lyon sas Helsos personally visited her to apologize and she convinced him to let her into the army.
Clarricie's profile also also compares her to a warrior goddess named Gradia but no elaboration on who that is or what culture's deity she is.