Chords in D Locrian

D Locrian is built from the notes D, Eb, F, G, Ab, Bb and C. Its scale carries 3 flats. Harmonising that scale in thirds gives seven chords — 3 majors, 3 minors and 1 diminished — starting on Ddim as the iø. The chord on the fifth degree is Ab, a major bV, so D Locrian has the leading tone that makes a Ab-to-Ddim cadence sound final.

Beyond those seven, D Locrian commonly borrows D (I), Em (ii), F#m (iii), G (IV) and A (V) from the parallel major — the mixture chords that give a progression somewhere unexpected to go.