Vespus' Bolstering Buffer

You attempt to protect yourself and allies from an area of effect with a wall of shimmering energy. Make an ability check using your spellcasting ability against the effect's save DC. On a success, you and all creatures within range automatically succeed on the saving throw. If you would take half damage on a success, you instead take no damage. On a failure, you and all creatures within range have advantage on the saving throw against the triggering effect.