Arcanist's Ward

A creature you touch is surrounded by a field of arcane energy, appearing as a wisps of smoke wreathing their body. They gain 5 temporary hit points for the duration. If a creature hits them with a melee attack while they have these hit points, the creature's speed is halved until the end of their next turn and they take 5 necrotic damage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, both the temporary hit points and the necrotic damage increase by 5 for each slot.