To keep track of your damage reduction, it’s recommended that you write how much you can reduce each round somewhere on your sheet either in your notes, misc. powers, or elsewhere
Heavy Armor gives a low AC in exchange for a set amount of damage reduction to non-magical damage. The amount you can reduce resets at the beginning of your turn each round.
Shields do not effect damage reduction, they just add onto your normal AC.
Ring Mail : 30 Gold
AC = 4 + CON
Reduces damage by 3 plus your constitution per round
(Disadvantage On Stealth)
Chain Mail : 70 Gold
AC = 6 + CON
Reduces Damage By 6 Plus Your Constitution Per Round
(Disadvantage On Dex Rolls)
Splint Leather : 200 Gold
AC = 8 + CON
Reduces Damage By 9 Plus Your Constitution Per Round
(Disadvantage On Dex Rolls)
Full Plate : 1,500 Gold
AC = 10 + CON
Reduces Damage By 15 Plus Your Constitution Per Round
(Double Disadvantage On All Dex Rolls)