Death and Arachnophobia. ...Death is a person, Arachnophobia is an organization. Arachnophobia is led by a witch named Arachne, and she's dead, except she found a way to not completely die, and the whole thing in the mansion was an attempt to resurrect her and prevent a future where Death is the world's leader. Except the future they were making was even worse.
I forget if r4 used Death or Shinigami, so let's blame magic translation