Personal

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some backstories for memo<<<<

the first key part of the summoning
is to understand the fundamentals of spirits
they are old as the universe
but never had a chance to exist.

so they crave to be whole again
by devouring the reality.

feed them with your flesh,
and you can borrow their strength
as they are part of the akashic, they will rewrite the record.
but only the past ones.

....

but if you can give up a whole century of future timespace, others included,

the high seraph will lend you his hand.

so what is your wish?
and she answered 'everything.'

so here is the the lost key