The song Percipere is possibly the single most useful song in the game. It is given to Capell by Saruleus along with Prudentiae and the Saruleus Flute. It is the only song in the game which must be played to advance, which happens twice, once in the Dragonbone Shrine and once in Castle Prevant. Objects that can be revealed by Percipere are denoted by a slight distortion in the air and a distinctive sound. Percipere is also the only thing that can reveal Vermiforms.