F♯ Ultralocrian
F♯ · G · A · B♭ · C · D · E♭
The seventh mode of harmonic minor, F♯ Ultralocrian is a Super Locrian scale with the seventh flattened twice, so it spells out a diminished seventh chord over an altered root. It's about as tense as a scale gets, used over altered dominants resolving into minor keys. Deep jazz territory.
Left-handed