Azadi Emissary to the Northlands and governess of the associated provinces, she is stationed in the great Azadi Tower in Marcuria. Indeed, she has been tasked by both the Prophet and the Six to have the Tower finished in time for inauguration by the Azadi empresses. The Prophet apparently sees it necessary to threaten the Emissary, and she appears to fear him. After their meeting, she decides to work late into the night, asking her hand-maid, Alisa, to bring dinner to her office.
When April takes a look at the Azadi Tower for a night, she finds Sahya in her office, talking to the Prophet about the upcoming arrival of the apostle Kian Alvane in Marcuria, and shows concern about the motives of the Six for sending him. The Prophet advises her to let someone watch over Kian's steps in secret. She accepts this advice, but stays worried even after the Prophet left - so she orders her hand-maid Alisa to bring her dinner to the office, since she has to work for the rest of the night.
Some time later she welcomes Kian Alvane cordially and offers him help in his mission to kill "the Scorpion" . But since she's still suspicious of intervention from the empire's capital she asks Commander Vamon - seemingly her right-hand man, and even more unsympathetic to Alvane - to spy on him. This suspicion, coupled with Vamon's frequently-voiced irritation at Alvane's obedience to the Six, already indicates that the Emissary has her own agenda divorced from that of her empresses.
One year after the events of the previous game, Sahya continues to maintain political control of Marcuria, and is revealed that she, along with her illicit lover Vamon, have been using their offices to advance their own interests over Azadir’s, and plan to orchestrate a takeover of the empire using the Calculating Engine as their trump card. When informed that they will be visited by the First of the Six, Mother Utana, and General Hami, Sahya and Vamon work to conceal their actions, including the botched execution of Kian Alvane. However, after Hami discovers evidence of both Sahya and Vamon’s treachery, and of the Empire’s plans to eliminate all magicals, he and those loyal to him join forces with the rebels, and their combined forces are enough to beat back the Azadi occupying forces in Marcuria. After the Calculating Engine is shut down, a desperate Sahya turns to Vamon and suggests that they turn themselves in and request clemency. Vamon has other plans: planning to lay blame over their disloyalty entirely at her feet, he kills her.
The "Art of Dreamfall" book that came with the Limited Edition names her "Sister Sayha". This is most likely a misprint in the book, as April mentions her name if the player uses the "Look" action on her before eavesdropping.