Blood Armor

When you strike a foe with a melee weapon attack, you
can immediately cast blood armor as a bonus action. The
foe you struck must contain blood; if the target doesn’t
bleed, the spell ends without effect. The blood flowing
from your foe magically increases in volume and forms a
suit of armor around you, granting you an Armor Class
of 18 + your Dexterity modifier for the spell’s duration.
This armor has no Strength requirement, doesn’t hinder
spellcasting, and doesn’t incur disadvantage on Dexterity
(Stealth) checks. If the creature you struck was a celestial, blood armor also
grants you advantage on Charisma saving throws for the
duration of the spell.