Sorcerers are spellcasters that specialize in the realm of Sorcery. Sorcery is a black magic, similar to Voodoo, but has nothing to do with the spiritual realm. It is more of an Arcane realm, manipulating energy in the universe. This black magic results in various effects like Weakness, Invisibility, Paralysis, etc. One may consider them "dark wizards" for lack of a better term.