B C D E F G A B is B lorcian.
The sound kind of resembles that of a half diminished seventh chord. The intervals are 1 b2 b3 4 b5 b6 b7
The b5 makes it the only mode without a perfect 5th. Its not very suitable for for music in practice. Its a diminished 5th. But also the b2 makes it very exotic.
But accedently hitting this mode... Its very weak. Thats why it isn't used. Not so much because it is evil. Still, a diminished chord all the way trough the piece, only diminished fifths, no perfect fifth, no resolved dissonance ever, will still not be very pleasent.