[SPOILERS] At the end of the 3.4 story Papalymo made the remark about how he shouldn't have given Yda that mask. I'm guessing That Yda is Ala Mhigan royalty and that Papalymo gave her a mask to disguise her and helped her sneak out. He might regret this decision due to the amount of danger she has experienced since. Especially since becoming a member of the Circle of Knowing.