Theress held the rank of captain within the security organization of House Teral. In the era of the Cold War, when House Ulgo launched an assault on the Teral estate, Theress's security personnel received vital support from a Jedi Consular.
As the chief of security, Theress demonstrated unwavering allegiance to House Teral. He possessed an absolute commitment to defending the last bastion of House Teral, prepared to fight until his dying breath, even when faced with insurmountable challenges. However, he greeted the aid offered by the Jedi's with open arms, expressing both appreciation and astonishment at the Consular's combat prowess.