Sorcery is a definetly a important part of the DCC RPG and it should be present in the Adventurers of the Lost World setting. The atlanteans are masters of sorcery. They are alien beings without the mortal soul and mortal limitations that us humans have. Thus, sorcery was not meant for the mortal mind and body. DCC RPG already makes the use of magic a dangerous bargain, but I wanted to emphasize this hard bargain with a class that makes it clear that theses are forces no one in their right mind should be meddling with. So it's born the Occultist.
Occultist
You discovered that the reality that surrounds us is not really what it seems. The rigid laws of physics are not that rigid. They are malleable, like clay. Seeking occult knowledge, ancient tomes, forgotten entities with forbidden secrets, occultists are capable of transforming the universe around them using ancient formulas and sinister sorcery. The Lost World, to them, is a treasure trove of knowledge and power, ripe for the taking.