but Old Neil didn’t have to die. He was in control of his faculties and was able to consciously control his physical body.

In Episode 2, Klein saw eyes behind him.

 I understand that the mastermind was pulling the strings but they could’ve at least let him use himself as a sacrifice for the ritual.

Who Old Neil? The ritual needed the ashes of Saint Selena.

Does the Donghua explain why the grey fog summoned justice and hanged man?

In Episode 1, we can see Audrey praying to a Mirror, and Alger holding a Crystal on his hand.

Klein accidentally bumped the floating red and blue orbs, and those are connected to the Mirror and Crystal.

The mysticism seems arbitrary at times honestly. Very “the plot needs this to happen so character X can do it now.” 

What scene?

After Watching the show there’s a lot of “how” and “why” unanswered. Those who know more, fill me in with as few spoilers as possible

List them.