Seth Kabul was the brother of the noble Lorn Kabul and the uncle of Arista Kabul.
Wanting to take over Lorn Kabul's mining operation and conspiring with the Imperial Moff Harsh, Seth had Lorn Kabul and Arista assassinated. While Lorn Kabul died, the brave Gamorrean Grissom managed to save Arista's life.
With the help of Grissom and a Jawa called Tek, who had a weakness for blowing things up, Arista managed to sabotage the mining operation, thus ruining everything Seth had planned and leaving him a ruined man.
- The Complete Star Wars Encyclopedia