Available for download, Mystica from Best Service is a virtual instrument powered by the Native Instruments Kontakt engine and able to run on the included Kontakt Player. It features extensive sampling of an eight-person female choir, and offers the same phrase-arranger and words as Cantus, its sibling library. Thus, it can be used alone, or in seamless conjunction with Cantus for a mixed-gender choral sound.

Produced by Eduardo Tarilonte, this instrument offers a powerful word builder which combines 120 elements including 24 words and their syllables with 5 true legato vowels and a special "Mmmh" articulation. The library is particularly useful for composers and sound designers, as it's designed to provide a versatile sound suited to both esoteric and liturgical melodies, and thus, can pair well with film productions, video games, demoing for choral works, and appropriate genres of music (new-age, for instance).