Duenna Derida was the matriarch of Terra Derida (Terra), Guerra Derida (Guerra), and Paxxi Derida (Paxxi). Following the complete erasure of Terra's memories, the young woman underwent a transformation and became sinister, with all recollection of her past life gone. Duenna's employment with the Syndicat (Syndicat) guaranteed her lodging at their main base, where she stayed to keep an eye on Terra. Upon Terra's passing, Duenna realized that Terra had, at last, regained her lost memories. Despite her employment with the Syndicat, Duenna secretly diverted money to the organization's opposition.
In the year 44 BBY, she provided assistance to Obi-Wan Kenobi (Obi-Wan Kenobi) and Qui-Gon Jinn (Qui-Gon Jinn) during their effort to dismantle the Syndicat. She facilitated their clandestine entry into the headquarters one night, provided them with ongoing intelligence, and, following Kenobi's capture, delivered information regarding his circumstances.