At 10th level, a bloodmage can temporarily access all of the bloodline powers of a given sorcerer bloodline as if she were a sorcerer of a level equaling her total arcane spellcaster level (including bloodmage levels) by consuming blood tied to that bloodline. By drinking 1 pint of fresh blood (which inflicts 1 point of Constitution damage) from a sorcerer with the given bloodline or from a creature affiliated with that bloodline, the bloodmage gains the ability to use the bloodline powers (but not bonus spells, proficiencies, and so on) as appropriate to her level for 1 hour. This ability is usable once per day and drinking the blood normally requires a full minute, but bloodmages with the Brew Potion feat can distill the blood into a potion-sized draught that can be stored and consumed as a standard action.
Any bloodlines absorbed are in addition to the original bloodline of a bloodmage with sorcerer levels. Though the bloodmage gains no physical nourishment from drinking blood, this practice is likely responsible for many of the stories linking bloodmages and vampires.
In addition to sorcerers of the given bloodline, the following list presents a few examples of creatures whose blood is considered affiliated to a bloodline. There may be others who work equally well, at the GM’s discretion.
Aberrant: any aberration.
Abyssal: any chaotic evil outsider.
Arcane: any arcane caster, or any creature with an arcane spell or spell-like ability of at least 3rd-level.
Celestial: any good outsider.
Destined: any creature able to cast divination spells.
Draconic: any dragon or creature with the dragon type.
Elemental: any creature with an elemental or energy subtype (air, cold, earth, fire, water), provided it has flesh and blood (such as a salamander, but not a fire elemental).
Fey: any fey or gnome.
Infernal: any lawful evil outsider.
Undead: any undead creature with flesh and blood (such as vampires or ghouls, but not skeletons).