Here’s the ones I know Black - Darkfriends Yellow - Healing Green - Battle and take lots of Warders Blue - Investigative Red - Gentle men who can channel, don’t generally take warders Brown - Seeks knowledge I don’t exactly know the other two though, does it ever explain what the Grey and White ajahs do? I know that the White is described as being “logical and unfeeling,” but what do they do? And I swear that Grey was never touched on. EDIT: Thanks everyone! Your answers have really cleared things up for me.