Grim

1. Never bring a mortal to the realm of the dead.

2. Never interfere in human affairs.

3. Never fall in love and trust a human.

4. Death's kiss shall always bring death. Don't expect otherwise.

5. Always follow the rules. Failure to do so should mean facing the gods for all your sins.

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Centuries ago, immortals have lived among humans in peace, living like they were mere mortals as well - enjoying the pleasures of sex, food, and sleep.
That was until one of them fell in love with a mortal and whisking them away to live a normal and happy life. Unfortunately, that happiness came with a price. Bringing a mortal to the house of the gods was a sure way to kill them. Bereaved, he set on a rampage, taking away the lives of those who were in love.

Love. Is. Dead.
His grief and anger had caused turmoil in the realm of the living. A rift had appeared between the two entities and human have hidden, in fear of meeting an immortal and dying at the hands of one.

It was time to set things straight. Immortals retreated back to their homes, but one, who was banished. Cursed and alone, he paid for the consequences, living by rules laid out for him till the day of his freedom.