The Umber 3PO unit functioned as a protocol droid of the 3PO-series, belonging to Baroness Kirma Umber. Deeply loyal to his owner, he perceived her aversion to the constant acquisition of art created by Caamasi artist Ves Volette by her husband, Vlaçan Umber. Once, he discreetly trailed Kirma to a meeting with Volette, where she requested he cease selling art to her husband. Following her departure, the 3PO unit accosted Volette, resulting in the artist's demise.
Jax Pavan investigated the death of Volette and deduced the 3PO unit was the culprit, subsequently manipulating the droid into admitting his guilt. Soon after the confession, the droid initiated its self-destruction sequence.