Guild Sorcerer
True magick, as sorcery is sometimes known, is strictly outlawed in all the Known World, and has been even since the days of the Empire of Man. Some few people still strive to learn a spell or two, always hiding their ability. However, there are still some others who dedicate their lives to the pursuit of magick. These individuals are called sorcerers (the term 'mage' has always been used in a general sense, to refer to anyone who possesses magickal ability).
Sorcerers are the most powerful wielders of magick in the Known World (Zalanthas itself does in fact contain several more powerful users of magick, such as the Dragon). They possess their own routes to learning elemental (and other) powers, and can eventually learn most known spells. For this reason, sorcery can be considered 'true' (in the sense that it is unlimited) magick.
Because of their potential power, the Kings of Old, as well as the lords of the city-states of the contemporary world, do not permit sorcerers to exist. All who demonstrate knowledge or use of wizardry are typically killed at the earliest opportunity. Being powerful in the way of psionics, High Templars and the Kings themselves can easily sense a sorcerer's presence if said sorcerers do not properly shield their minds at all times.
Sorcerers do not 'automatically' gain energy to cast their spells as elementalists can. They must instead gather it from sources of life.