The Blood war is the common name for the war between demons and devils. Early cosmologists expressed surprise that the two groups were at war, but as scholars studied them it became evident why. demons want nothing but destruction, they would destroy all of creation if they could. They fight with angels, they fight with devils they even fight with the mysterious Qlippoth, who coexist with them in the abyss. devils on the other hand, would prefer to subjugate all of creation, they prefer power over others over sheer destruction. devils are clever enough to know that if they allied with the demons they could overcome large portions of the heavens that are allied against them, they also know that the demons would turn on them immediately. The Blood war waxes and wanes, when the demonic hordes are focused elsewhere the devilish troops do not actively attack them, but greater devils constantly scheme for ways to weaken the demons. Of course, greater devils constantly scheme for ways to weaken everyone other than themselves.