Moxana is one of the Muses built by master spark van Rijn for the Storm King. She plays games and tells fortunes, and seems to be exceptionally perceptive. She's been called the "Muse of Mystery", though this may have been less a reference to her purpose than to her cryptic communications. It's not her fault; she just can't talk.
She tends to express herself in the form of Tarot cards  and particularly symbolic chess moves , which became a significant factor in the decision-making process in Master Payne's Circus of Adventure.
In the backstory she and her "sister," Tinka, had traveled with the Circus for many years, hiding in plain sight from the many Sparks who would wish to dismantle them. But in a trip through Sturmhalten, Tinka was "discovered" by Tarvek Sturmvoraus and confiscated.
Since then, until Agatha Heterodyne was accepted into the circus, Moxana had become increasingly despondent. When Moxana revealed that she had in her possession a technical notebook of Van Rjin, Agatha was going to try and use it to build her a new sister, but then Sturmhalten happened (again), and Tinka and Moxana were re-united in the Sturmvoraus family stronghold. When last seen, Moxana apparently had accepted Tarvek as the legitimate hereditary heir to the Storm King. However, an injured and captured Tarvek was soon hauled away to the Great Hospital at Mechanicsburg, and the highly-destructive Battle of Sturmhalten erupted. Following this and the two and half year Time Skip, Moxana's and Tinka's fate remains unknown.
Possibly relevant outside informationEdit
Moxana's design is inspired by the The Turk, a fake chess-playing machine constructed in the late 18th century by Wolfgang von Kempelen. The machine consisted of a life-size mechanical puppet operated by a hidden person under its chessboard, tricking observers into believing that the machine itself was capable of playing chess against human opponents. In the comic, Abner offers this same story to Krosp before Moxana's true nature is revealed.