The E Locrian scale has 7 notes: E – F – G – A – B♭ – C – D. Locrian is the darkest mode: a minor scale with a ♭2 and a ♭5, built on the 7th note of the major scale. Its root chord is diminished, so it is used for tension rather than as a home key.
Compared with the E major scale it has ♭2 (F instead of F♯), ♭3 (G instead of G♯), ♭5 (B♭ instead of B), ♭6 (C instead of C♯), ♭7 (D instead of D♯).
The explorer above is set to E Locrian: the whole neck is mapped, and you can zoom into any of its 7 positions, change the labels to degrees or fingers, and hear it up, down and in patterns.