Blood Shell

When you or a creature within 30ft of you takes damage, as a reaction you may use the spilled blood to create a defensive shell around the damaged creature. This causes all incoming damage to be forced to go through the shell first, however this does not protect from the triggering damage. The shell flows freely before hardening to intercept damage, allowing the protected creature to act normally. 

The shell has a number of hit points equal to 15+ the damage taken that caused this reaction and increases the targets AC by 2. If a creature adjacent to the protected creature is taking bleed damage, that damage is automatically added to the hit points of the shell.