Three prominent nebulae dominate the Skyrim heavens – the thief, the warrior, and the mage. Each of these represents one of the three master skill sets. Each nebula houses six constellations, each of which represents a skill.
This http://www.gameinformer.com/cfs-filesystemfile.ashx/__key/CommunityServer-Components-ImageFileViewer/CommunityServer-Components-SiteFiles-imagefeed-featured-bethesda-elderscrolls-elderscrollsv/SkillsMenu.jpg_2D00_610x0.jpg, which we've seen before, displays various skills with Alchemy, Illusion, Conjuration, Destruction, Restoration, Alteration and Enchanting all easily identifiable. Perhaps I'm just not sufficiently clued-up on what these skills have had as their governing attributes in previous Elder Scrolls titles, but which skill from the seven mentioned is not one of the six which constitutes the Magic Nebula?