Prayer composed by the nuns of the monastery of Santa Clara, in Coimbra Portugal, to implore divine mercy in the face of the Black Death in the 14th century, the same prayer with which the Church cried out for God's help during the pandemic, the plague of the 21st century. Performed to the Gregorian melody. This is the first time in history, as far as we have records, that a performance of this piece is turned into an NFT. In addition, this NFT contains the only copy of the performance of the work. The file will be destroyed after mining, to make this NFT an absolutely unique piece.