Conan set his teeth and drove the sword deep. Blood streamed over the blade and his hand, and the monster started convulsively, then lay back quite still.> - The Tower of the Elephant
Blood is an inevitable part of life in the Exiled Lands - splattered on the weapons and clothing of friend and foe, running from the victorious blade, soaked in the bandages of the wounded.
There is a power in blood, not just in the foul sorceries of black mages, but in the blood of ordinary men and women.
Blood can be mixed into compost to increase the potency of the mixture and bring additional life from this side effect of death.