Unlucky encounters with Dragons and such had cost them another third of the Subordinate Vampires. They poured holy water on the dead bodies to prevent their spirits from lingering in this world, but they couldn’t actually see spirits.

Only those with the Spiritualist Job can see spirits that haven’t become Undead.

That was why they couldn’t tell whether the spirits were in the vicinity of their dead bodies. The spirits could have rushed off towards the Dhampir and they would have never known.