Armor of Agathys (2014 5e)

A protective magical force surrounds you, manifesting as a spectral frost that covers you and your gear. You gain 5 temporary hit points for the duration. If a creature hits you with a melee attack while you have these hit points, the creature takes 5 cold damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, both the temporary hit points and the cold damage increase by 5 for each slot.

2014 Edition. This spell is the original version from the 2014 5e edition of the Player Handbook and is compatible with that system. It can also be used in the 2024 5e system if necessary.