Vampires can find blood through numerous sources. Most
commonly, blood comes from humans. They can also feed
from stored blood, from animals, from other Kindred, and
rarely from other supernatural creatures. Note the Blood
Potency restrictions on what powerful Kindred can feed from
(see p. 90).
Vitae is not blood. At least, not directly. Blood flows through
mortal veins; Vitae through Kindred. However, when Kindred
"spend" Vitae, their bodies do not lose the fluid that animates
them; it simply becomes inert. Picture Kindred blood as paint.
Blood is the oil, the water, the vessel. You can't paint with oil
or water. The Vitae is the pigment. It brings color, it makes the
paint vibrant. It's only a small part of the mixture. You could
remove the pigment and still have a pail of fluid, it just wouldn't
be very useful on a canvas.
Human blood is best warm, from the living. Kindred can
pull a number of Vitae from a mortal equal to the mortal's
unmodified Health dots. Every point of Vitae she takes causes
one point of lethal damage. If she takes more Vitae than the
human has dots of Stamina, he suffers the Drained Condition
(see p. 303). Once a vampire attains her sixth dot of Blood
Potency, she no longer finds human blood nourishing.
Cold blood from a corpse or kept outside the body for
more than a few minutes (but no more than a night) is far
less satisfying. To gain a single point of Vitae, a vampire must
consume as many pints of this blood as her Blood Potency times
two. Technologically stored blood, for example in refrigerated
plasma bags, is similarly unpalatable to potent Kindred.
Kindred Vitae is a dangerous food. First off, Vitae is addicting
(see Vitae Addiction, p. 99). As well, it causes the blood bond
(see Blood Bonds, p. 90). However, it's efficient. Every Vitae
taken is a Vitae earned, and this causes no additional damage
to the victim. Stored Kindred Vitae is effectively cold blood.
Animal blood is a challenging meal that provides only limited
sustenance for the youngest of Kindred. Size 0 animals provide
no nourishment. Size 1 animals provide one point of Vitae. For
example, a large rat will provide a single point of Vitae. Size
2-3 animals provide two Vitae each. Size 4-5 animals provide
3. Each point of Size above that adds one more Vitae available.