For a warrior of the faith you falling to your knee in prayer is not a sign that the battle is over, only that it has just begun. When you place a page of your sacred texts to the ground and thrust your weapon onto it the very heavens open and send down massive blessed blades in a 50ft cylinder centered on you. While you take no damage every creature within the cylinder must make a DEX save vs your spell save DC or take 5D10 radiant damage or half as much on a successful save. However demons, devils or undead have disadvantage on the spell save and take an additional 3D10 radiant damage for a total of 8D10 radiant damage.