A Mighty Fortress

Name A Mighty Fortress
Cooldown encounter
Action standard
Range close burst 2
Target allies
Save none
Power divine-shield
Class fighter
Min Rank 3
Category Defense

Encounter, std, close burst 2; for 3 rounds, you and allies within the area gain resist 50% to all damage and advantage on all saving throws. The protection ends for a creature that leaves the area, and resumes if it returns.