Blood Armour

Your blood becomes as hard as iron on contact with air. If you take at least 5 piercing or slashing, your blood infuses your clothing or armor and strengthens it, granting you a +1 bonus to Armor Class on your next turn. If you take at least 5 piercing or slashing weapon on two or more consecutive rounds, this bonus increases to +2.

If a creature has an ability to drain blood, you gain an additional +1 bonus to Armor Class and have advantage on any saving throws against that ability, as well as resistance to damage caused by such blood drain.