Although each individual zin possesses a bardic voice, when they play and sing together as a band, their music takes on a supernatural quality that it did not possess before. In order for this eldritch music to be effective, the zin must be within 10 feet of one another. Spells .cast. by a band are extremely difficult to resist (-1 on saves per zin present) and depend upon the number of zin in the band (per the following table).
Duo: hold person or suggestion
Trio: charm monster or emotion
Quartet: Leomund's lamentable belaborment or chaos
Quintet: mass suggestion or charm plants
Sextet: demand or Otto.s irresistible dance
The spell “repertoire” is cumulative (i.e., a quartet knows the spells of a trio and duo). A zin band can collectively cast any spell from their repertoire, once per round, at a level equal to three times the number of zin present.