Generally how this Build works is that you'll sent up your combo of either Magic Glintblade & Moonlight Greatsword or Greatblade Phalanx & Moonlight Greatsword against enemies depending on what you are facing (Magic Glintblade for weaker ones, Greatblade Phalanx for tougher ones).

It generally goes something like this, buff your Greatsword with L2, cast Magic Glintblade or Greatblade Phalanx and then either hold R2 or charge forward into range and then hold R2 and then hit R2 again. You're trying to time it so that the wave from the Greatsword connects with the enemy around the same time as the spell, or just before, so that the spell staggers after the wave, allowing you an opening for a second wave.

You can use Unseen Form to help you navigate levels, avoiding ranged enemies that might hit you unsuspectingly, allowing you to range them down with Glintstone Pebble or Magic Glintblade.

Loretta's Greatbow is there for very long range when the situation calls for it. Sometimes you just need a bit of range, and this spell single handedly takes care of that.