A Picardy Third, this one pitched in D minor. Chorales use them almost always when a song is pitched in a minor key.

"The Garment of Night, Surly, Blasphemous, Turning away the world and the divine. Preparations for the end. Pessimism and giving up. Belief in darkness."

Despite its parallel major's ubiquity, B♭ minor is one of the rarer keys in a musician's playbook, namely due to its complex key signature. Not much music uses the key, but when it is used, B♭ major usually follows in a "Picardy Third," the name for when a song pitched in a minor key ends in the parallel major