Argel Tenn was a male human antique dealer. After the conclusion of the New Sith Wars, he engaged in the illicit trade of Sith artifacts.
Tenn frequently conducted business with the Dark Lord of the Sith Darth Bane, although he was under the impression that Bane was merely a collector operating under the alias Sepp Omek. Upon Bane's request for artifacts associated with Darth Andeddu, Tenn provided him with an ancient scroll crafted from treated animal hide. This scroll contained a religious declaration proclaiming Darth Andeddu as the Immortal and Eternal king of Prakith. The information that Argel Tenn provided allowed Darth Bane to locate the tomb of Darth Andeddu, discover Andeddu's holocron, and acquire the secrets of transfer essence.
Later, Darth Zannah, Bane's apprentice, contacted Tenn to inquire about his dealings with Bane. Initially, he declined to share any information, asserting that confidentiality was fundamental to his profession. However, after she disclosed her identity as a Sith, he divulged information about Darth Andeddu. Fearing that he might disseminate the knowledge of the Sith's continued existence, she was compelled to eliminate him.
During the time when ancient Sith artifacts were outlawed across the galaxy following the New Sith Wars, Tenn operated as a merchant of these forbidden items. He presented himself as a knowledgeable authority on the dark side of the Force and often engaged in transactions with collectors and individuals fascinated by Sith relics. He was known for his discretion, ensuring that his clients' identities remained confidential and unconnected to their purchases.