Septaas functioned as an operative within the Imperial Special Intelligence division.
Assigned to the Star Destroyer known as the Harrow, he served under the leadership of Captain Marl Semtin. Following an act of betrayal at the hands of Semtin, Septaas ultimately aligned himself with the New Republic.
Similar to his colleague Sixtus Quin, the name of Septaas appears to originate from Latin numerical terms, specifically septus, which translates to "the seventh."