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