Mancers, as a broad catogry is a studdent that follows a specific path, element, or school of magic. Mancers choose to channel their magics to less fields then a mage would and thus become stronger in those fields, this does mean that they grow weaker in others though. The following is a list of the types of Mancers in existance to choose from.
Geo-Mancer: Wizard of Earth.
Aero-Mancer: Wizard of Air.
Aqua-Mancer: Wizard of Water.
Pyro-Mancer: Wizard of Fire.
Crono-Mancer: Wizard of Time.
Necro-Mancer: Wizard of Astral.
All but two of these types have opposing paths, Crono, and Necro. When a type of Mancer is choosen, the Mancer cannot learn spells that use elements from the Opposite path.
Geo ~ Aero
Aqua ~ Pyro
Mancer are allowed spells from the following schools: Primary Path, One other Element (none opposing), Divination, Abjuration, Enchantment and Raw.