Review Detail of GrizzWald in The Reincarnator's Tavern

all classes can learn Sorcery, but there is a catch. Learning Sorcery requires sensing external energy. Classes that possess internal energy would have great difficulties sensing external energy because their energy senses are geared toward the same energy they use. Unless the Player figures out how to cheat, they will only be able to learn Sorcery after mastering the energy of their own system, since they will be unable to filter out the energy they sense from their own system otherwise. If they can't, then a Player will take far longer to learn Sorcery than a normal student at Kamar-Taj.

All of them are internal. Wizards have internal magic. Warriors have internal Ki. Ninjas have internal Charkra. Jedi have internal Force. Hunters have internal aura. Pirates who've eaten a devil fruit have the energy of that fruit within them. When a Player with a form of internal energy tries to sense energy, their senses will be blinded by their own internal energy and be unable to easily sense. Imagine a room with white walls. On one of the walls there is a single splotch of glow in the dark paint. Finding it would usually require turning off the lights, adjusting your night vision, and analyzing every wall until you found the glowing spot. Having an internal source of energy means that there is a flood light in that room and the only way to turn it off is to master the use of the flood light or cheat or get lucky.