Abersyn symbiotes were a species which feed on the brain stem of sentient species. They had to be fed into a plasma furnace in order to kept them in a quiescent state, though a regular exposure to a plasma vent has been proven to have the same effect on them. They were known for being responsible for the death of many historical empires, therefore having a specimen was banned by Imperial decree.
During her time as a doctoral student in the University of Bar'leth, Aphra was studying and exploring the planet of Boothi XII looking for an incredible discovery. After finding nothing on Boothi XII, Toob-Nix, Aphra's doctoral supervisor, showed her a full nest of Abersyn symbiotes in his personal chamber, telling her why he hated her so much and that he would never give her his approval to get the doctorate. As revenge, Aphra stole the whole nest with the help of Sana Starros and made it appeared as if she had finally found the Abersyn symbiotes on Boothi XII. As part of the Imperial protocol, the symbiotes were disintegrated right away.
- Doctor Aphra 1: Book I, Part I (First appearance) (Appears in flashback(s))
- Doctor Aphra 2: Book I, Part II (Mentioned only)
- Doctor Aphra 5: Book I, Part V (Mentioned only)