I wanted it to raise tons of questions
Only one is undead, the one who left.
Yes, it was Camael and Laylah who appointed her. There are several reasons as to why, the most important of them I can’t tell
But the other reasons are:
- Her soul and light(that’s the measure of an Angel’s strength) is just as strong as Celestiel’s.
- She’s an Archangel. Only Archangels can be Guardians to the Lord/Lady. This is because they have no “true” responsibility. They only find roles from within the other Orders which suit them best, thus, they have no actual obligation within their own Order.
- To put it simply, they’re close friends. But in Heaven’s definition: “They studied and trained under the same Virtue(teacher of the Angels), and have formed a special bond in a span of centuries.” This is also why Sariel can appear immediately if Celestiel called to her. This passed on(though only partially since there’s a ritual to fully achieve this) to the MC since Celestiel’s essence and light was imbued in them.
Sadly, the most important reason will not be revealed in the first part of the story…