When does Armor of Agathys take effect given that Damage Reduction happens first?
Consider a character with Heavy Armor Master which says:
- While you are wearing heavy armor, bludgeoning, piercing, and slashing damage that you take from non magical weapons is reduced by 3.
and Armor of Agathys which says:
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.
If the character is struck for 3 or fewer points—all damage would be negated by Heavy Armor Master—does the attacker still take the 5 points of damage from the Armor of Agathys? or because the Armor of Agathys did not absorb any damage is the attacker unaffected?