Dragonblood Component

 
Prerequisite(s): Arcane Caster, Draconic Bloodline or Dragon Blooded
 
Benefit: When casting a spell, you can give up some of your lifeforce in place of material components. Components that are common drain 1Hp per level of the spell. Components with a listed cost drain 1/25 the Gp value in Hps. Spells with a Focus, drain 3hps per spell level.
 
Source: Mongoose Ultimate Feats