Ria gives her oath.

Chapter 8 - Part 3 (Voyage of the Dawn Breaker)

Previously, Rhyslin gathered the ladies together and set forth the expectations for each of them. Keisha is ecstatic that Flur has consummated her bond with Rhyslin but warns him that he’ll be in trouble when he gets back home. Rhyslin explains to Flur, Ria, and Rana who Rowena is and says that he’ll no longer be able to refuse her what she wants. He asks Ria why she wants to join his house, and after she explains, he asks her if she remembers the oath.