For the advanced vampire, death is rarely a sudden accident; it is an

In some lore, a vampire’s body adapts to its environment over centuries. Those in the deep sea become translucent and pressurized; those in urban sprawl develop "spirit-senses" to navigate the white noise of millions of heartbeats.

Among high-tier vampires, to be "forgotten" is a form of death. If no one fears or speaks of you, your tether to the physical world weakens.