You bless a region with divine light. Choose a 1-mile-radius area centered on a point you can see. For the duration:   The area is bathed in warm radiance that purifies disease, poisons, and curses.   Undead and fiends cannot enter without succeeding on a Charisma saving throw (DC = your spell save DC).   Crops flourish, water purifies, and all creatures regain twice the normal hit points from rests.   Creatures who die in the area cannot be raised as undead by any means.   Once the spell ends, its effects linger for 7 days, gradually fading.