I don't normally do this but I thought it would be a great or unique idea.. So I was thinking maybe a Bubble Shield has a range of rage/healing spells, and it just protects any troops inside the shield, also the shield has a health to it. Once the shields health is tooken out the defense and resume attacking the troops.
So let's say a Lv1 Bubble Shield can have high amount of hit points protects any troop inside of it until they leave shield or it gets tooken out. All nearby defenses target the existing shields.
