Watch the C Lydian 1 online guitar lesson by Robbie Calvo from 50 Modal Licks You MUST Know
This is a great lick using a pedal tone of C to then descend through the scale creating wider and wider intervallic tonalities. The phrasing is key here though, so check the tab and notation to nail that before moving on to the final sequence in this lick.
I'd also advocate playing this idea slowly and then bring it back to speed gradually. Remember, speed is a by-product of accuracy! Your alternate picking will get a workout on this phrase too! Enjoy!