'Tch, evil spirits… one of the most annoying enemies in the game…'
Evil spirits don't actually attack you physically; in fact, they don't even appear in front of you and confront you head-on.
If you try to get close to them, they will run away and avoid you like crazy, so catching them is very difficult.
Their preferred method of fighting is to hide and use shockwaves to inflict mental and spiritual damage on the target.
Aside from the mental attacks, they constantly keep wailing and shouting with an extremely loud voice that is very irritating to hear. Long-term exposure to this voice can drive a person insane.
The best way to get rid of them is to use 'Light Magic' to shine bright purifying light everywhere and directly purify them altogether without leaving a single place for them to hide.
The second-best method is to use a legendary skill and pulverize them with the power of a law of the world.