RULES OF THE UNIVERSE

Very Important rule: Angels and demons appear to the humans as humans themselves, but their intent is usually "felt" right off the bat by people with good instincts

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Permanent death condition

When humans die, they go to heaven or hell, unless there is something that preserves the soul or they get lost.

Angels and demons will die without hope of returning

Humans will become an angel or demon over time, if they stay long enough in heaven or hell.