Scarlet Upgrade: Blood Armor

Prerequisite(s): 4th level sanguine sorcerer, able to cast Blood Armor
Benefit(s): Apply the following modification(s) to your Blood Armor spell:
1) Blood Armor is renamed to "Blood Buffer".
2) Blood Buffer is treated as a Scarlet Spell.
3) "School: transmutation" becomes "School: transmutation [blood]".
4) "Casting Time: 1 standard action" becomes "Casting Time: 1 swift action".
5) "Duration: 1 minute/level" becomes "Duration: 1 round/level".
6) The effect of Blood Buffer becomes: "Choose one of the following damage types: bludgeoning, piercing, slashing. Upon being struck by an attack/spell/etc. that deals damage of that type, you can spend a free action (even if it is not your turn) in order to trigger the effect of Blood Buffer, in which case you gain [x] temporary hitpoints and the duration of Blood Buffer ends prematurely."
7) "[x] is equal to the amount of damage that was dealt to you times two" is added to Blood Buffer.