Major responsibilities for the Spirit Legion include: research and creation of ter'angreal and angreal, the keeping of the Black Tower's supply of both as well as sa'angreal, research into the nature of saidin, redescovering weaves, and refining male channeling.

Angreal and ter'angreal 'library cards' are assigned by Captains and above based on need and the scale of the item in question, with higher requiring more permissions.

They have a very 'hands on' approach to their studies, often pursuing fieldwork. They can be found spread throughout most of the Westlands studying a variety of things. Often paired with other Legoins, they work especially closely with the Earth Legion, studying a range of occurenses from the reemergence of the Blight, to the best fortifications and warning systems for natural disasters. They are also incredibly fond of libraries though are most closely tied to the schools in various Nations, and less to the Aes Sedai founded World Library.

Spirit Legion had the fewest members respond to Rhalin's call for war, and that fact has helped maintain connections with the Brown Ajah, as well as the White and Gray, despite lingering tension between the Towers.

Their major goal, currently, is further research into the creation of items of power by both saidin and saidar in concert. Their relatively good relations with the Wite Tower gave them the opportunity to take advantage of the newly established exchange program by becoming chaperones for the the Dedicated. Though they don't enjoy being tied down to one spot for long almost as much as the Earth Legion, they do enjoy Tar Valon's extensive library and working with the Brown and White Sisters on their common goals.