Coat of Sanguine Defense

Rare Light Armor (Leather)
Requires attunement

AC. 11 + Constitution modifier
Unburdened. You can only gain the benefits of this coat while you are not wearing any other armor.
Regenerative Lining. When you take damage, you can use your reaction to reduce the damage be spending hit dice. You may expend and roll up to three of your hit dice. The damage is reduced by an amount equal the number you rolled plus your Constitution modifier. You can use this feature once per long rest.