Broken Ward (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||Concentration, up to 1 minute|
Support your allies with a fragile barrier of force that hits back with splinters when struck by a melee attack. A creature within range that you can see gains 2d4 temporary hit points for the duration. If the target is hit by a melee attack while these temporary hit points persist, the ward splinters and deals an amount of force damage to the attacker equal to the number of hit points it removed from this pool.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, add 1d4 temporary hit points for each spell slot above 1st.