"Purify" is a mode of Lanota.
While playing in this mode, you need to be careful. Avoid "Fail" to continue or the light in the shockwave will change its color from blue => green => purple => red. But more "Harmony" rates will rechange the color of the light in the shockwave.
Caution: Too much "Fail" will stop the music, the Notalium tuner will break and the result will be "Failed".
Chronosis song is the first song that you must clear in this mode.