Watch the C# Locrian 1 online guitar lesson by Robbie Calvo from 50 Modal Licks You MUST Know
C# Locrian is the seventh mode of the D Major scale, which means we are playing over a chord progression derived from the chords in the key of D but the progression resolves to the VII chord, C#Minor 7(b5). That means we have a tonal center of the VII chord.
The lick itself is a very melodic scale based run starting on the tonic of the C# Locrian mode,C#. Nothing too technical to worry about here at all. Just let the notes flow under your fingers and play the melody over this laid back groove.