Ursula
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If Vespers was Shiva, then she was killed by the Executor. Because if Metzger had done it, she wouldn't have had time to kill Arandor.
Why? And Metzger and the Executor both patrol Shiva's area.
5. Kills Shiva and Darkness.
6. Metzger and Rexev kill.
7. Beatrice kills.
8. Boucher and Night kill, a joint kill of Shiva and Darkness.
9. The Executor kills.
That's strange, what's with points 5 and 8? Shiva and Darkness are there in both.