A pint of blood used to construct the Hallowed Shrine.
Blood is the essence of life. Without blood, one cannot live, and if one is bleeding to death on the floor, their life is literally leaking out of them in a sickening red puddle. Blood can be preserved with an anticoagulant and a cool temperature, and because of this, you may be able to keep a part of them alive for longer, where you can pay them your final respects.
Can be found in blood banks and medical laboratories.