Onmyoji's might range to exorcists and temple priests but they are undeniably capable of understanding mystics and other things that only the supernatural and reality can handle. We don't even know whether they are indeed just posing as normal temple priests but will act as a capable and dangerous onmyoji once no one is looking. Even if they are not real, you can't deny that they do not add spice to the supernatural stories of Japan as the ones who protect humanity from the creatures residing on the other side.
Now, in the game, there are two types of ways how to play the class and one is to use your normal hands to draw signs in the air. It's a trick that has been used by many onmyoji after they learned that this was viable and not just something that only appears in media and entertainment videos. The second one is to use a Talisman. Of course, if you compare which style is better, the one who uses the talisman is undeniably stronger and no one will complain.
