Deep Magic Volume 2 (p.137)
Aegis of Honor
1-level Abjuration
Casting Time: 1 reaction which you take when a friendly creature you can see within 30 feet of you takes damage from an attack
Range/Area: 30ft.
Components: Verbal
Duration: Instant
You reach out toward the friendly target, placing a brief barrier between the target and the target’s attacker. The damage the target takes is reduced by 1d6 + your spellcasting ability modifier. If this effect reduces the damage to 0, you can turn the damage back on the attacker. Make a ranged spell attack against the attacker. On a hit, the attacker takes force damage equal to the amount of damage you reduced.
At higher levels: When you cast this spell using a spell slot of 2nd level or higher, the damage the target takes is reduced by an additional 1d6 for each slot level above 1st.
Available for: Cleric, Paladin