Leonardo's Imploding Shell (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Components:||V, S, M (a small purple feather)|
A creature in range you can see is encased in a purple sphere of armor, granting it a +3 bonus to its AC. At the start of your next turn, the shield implodes. The target loses the extra AC and the implosion deals 3d6 + 1 force damage to the target.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st. When you cast this spell using a spell slot of 3rd level or higher, the bonus to AC increases by 1 for every two slot levels above 1st.