A geological engineer and the design of the pulse modulator, Sienna secretly works for Dr. Woodrue. He pays her $3 million to cut out Arcane's heart and sabotage the modulator, letting Arcane take the blame and discrediting him with Sunderland.
Despite her attempts to seduce Arcane and keep him distracted, Arcane claims to see through her ruse. She ends up trying to save the machine when Swamp Thing destroys the acid that it relies upon, and dies when the fumes overwhelm her.
