This powerful enchantment is used by the Mages of the Black Order to offset the disabling effects of some of their more powerful spells. By using the fresh blood of a living creature, animal or Keldian, cut with a bronze knife and poured into a bronze bowl, the spell enables a Mage to ignore the attribute reducing effects of spells such as Sword of Night or Lesser Binding, or the Lethal / Weakening damage inflicted by spells on their caster. It cannot offset attributes lost to bind Demons, since that sacrifice is part of the Demon's price.
The spell can prevent one point of attribute loss for each 10 Health's worth of blood sacrificed. The blood may come from multiple people but the total points of blood obtained from each person is reduced by the number of people. For example to get 30 points of blood from 3 people requires doing 13 damage to each of them! From 6 people it would require 11 points to each (5 + 6). This spell is cast just before the spell to be enhanced, which must be begun in at most 10 minutes after the Blood Sorcery. Note that the spell to be enhanced and the Sorcery need not be cast by the same person.
Blood Sorcery can also be used to offset the cost of a burden. In this case the burden is divided between each of the people who donated blood (10 points worth for each burden). Each of these people gains Flaw : Burdened but does not suffer an attribute loss.