As with any mode, the most colourful sounding intervals are the character notes. In the case of the Locrian mode, lean into the minor 2nd and diminished 5th, and, to a lesser extent, the minor 3rd ...

Root, major 2nd, major 3rd, perfect 4th, perfect 5th, major 6th, major 7th The trick is exploiting the most colourful sounding intervals in your playing, which, in the A Ionian mode, are the major ...

So to make an 8-note major scale minor, you lower the pitch of the third, sixth and seventh notes by a half step. A half step translates to one fret on the guitar, or one key on the piano.

The trick is exploiting the most colourful sounding intervals in your playing, which, in the A Ionian mode, are the major 3rd (C#), major 6th (F#) and major 7th (G#).