Giving the impression of being a mere cheese vendor, Elling Trias is a man with more to him than it appears at first glance. He has a wide net of contacts, stretching from SI:7 to agents as far off as Hearthglen.
It's speculated by some that Elling Trias might be the former leader of the SI:7, and as such the mentor of . While not the former leader ( having handed leadership directly to her grandson), he may well have taken part in the extensive training that Mathias experienced for his leadership role, but as a member of the Stormwind Assassins.
He is probably still an active member of the Assassins, but now only assigns jobs and oversees lower members (such as and ), and discreetly investigates matters of national importance (such as in The Missing Diplomat quest chain).