Dorian b2 (also called Phrygian #6) borrows from two worlds: the warmth of Dorian's natural 6 and the darkness of Phrygian's b2. That bright 6th degree against a flat 2nd gives it an exotic quality you will recognize from Indian-influenced jazz and modern composition.
Scale Formula
1 b2 b3 4 5 6 b7 - Dorian with flat 2. Semitone pattern: H W W W W H W
Fretboard (C Dorian b2)
Use the interval toggle above the fretboard to see the unusual gap between the natural 6 and the b2 - that wide stretch on the fretboard is where the Phrygian darkness and Dorian warmth collide.
Common Chords
Minor triad (1 b3 5), Minor 7th (1 b3 5 b7), sus4 b9 (1 4 5 b2).
Diatonic Harmony
Improvisation Context
This mode shines over minor 7th (b9) chords and sus4(b9) voicings. The b2 pulls toward darkness while the natural 6 lifts back toward light, creating a tension that keeps the sound moving.
Practice
Put on a Cm7 drone and play C Dorian b2 a few times to settle into the sound. Then switch to regular Dorian over the same drone - only the 2nd degree changes (D vs Db), but you will hear the mood darken immediately when you go back. To really feel what makes this mode special, try landing on the natural 6 (A) right after playing the b2 (Db). That leap from the darkest note to the brightest one is the heart of Dorian b2.