KMST 1.2.435 - Luminous

To play this class correctly, you will need to switch between using dark skills and light skills. If you use too many of one, the other side's attacks will get stronger and the one your are using will get weaker. That means if you want to do the most damage, you can't spam one attack.

In this SS, the guy has been using a lot of Dark skills so the game is telling him to use Light skills.