It strikes me that this Move doesn't capture the fun flavor of turning undead present in old school D&D. I'm considering the following variant ... thoughts?
When you hold forth your holy symbol to the mindless undead before you, roll+WIS+Level. On a hit, choose targets whose total level is less than your roll. If you are Good, you keep these creatures at bay as long as you maintain the Turning (they will not come closer than 5' to you). While maintaining the Turning, you may move but cannot perform any other actions. If you are Evil, give a short command - they will follow it for a few moments.