The Coterie Infineum sounds like an uppity British gentleman's club.

Now that the Vanguard Pantheon Quest is in our past, Ten Ton Hammer continues on with an all-new quest series guide. Read the Overview of the Coterie Infineum Sanctuary, and find out why this quest series has become one of Vanguard's top-rated content!

CIS is a popular spot for adventurers to gather, form groups and
either just grind out some experience, or work on the many quests in the
series. The chunk is located just west of Ahgram, and can be reached via
first tier riftways as well.

Head to Ten Ton Hammer's VG site to keep reading.