A Blood Manifestation is a semi-solid manifestation of blood-like Ectoplasm. They are an exceptionally rare manifestation and are known to only appear in the presence of a power spirit such as a poltergeist. In some instances, it is possible that the manifestation can also take place in the presence of an Ectomancer.
For this many Blood manifestations to appear, a rare and powerful entity or Ectomancer must be present. It was suspected that Alec Roy was the one responsible, although his exact nature is unknown.