"You'll start to see a pattern, in time. Have patience.
"In the early days of humanity, a young man came to the God of Light. 'Please,' he begged. 'My sister is suffering a terrible sickness. She is in agony, night and day, and no herb nor magic can cure her.'
"'Alas, I cannot aid you,' replied the God of Light. 'To act upon your sister's torment would upset the great balance.'
"Devastated, the young man left the Land of Light. But he was not yet ready to give up on his sister, who suffered beyond endurance. So he journeyed to the Land of Darkness - to this very place, in fact - and begged the same of its ruler. The God of Darkness heard the young man's plea, and was moved. He promised that the woman's suffering would be ended that very night. Overjoyed, the young man returned home, ready to greet his recovered sister and family.
"But when he reached his ancestral home, no joyful family greeted him. The door was smashed to splinters, the interior wrecked and stained with blood. The man fled in horror. He sought answers among the townsfolk, and pieced together this: that on the very night he petitioned the God of Darkness, a terrible monster broke into the home of his family, and murdered all those within. Unable to bear the loss of his family, the man retreated into the dark woods, and was never seen again.
"And so it was that humanity asked the gods for mercy, and the gods gave humanity death. Made of the gods' own substance, the creatures of Grimm grew fat on the blood of humanity, and wore our bones upon their faces to bring us fear. They are drawn to suffering because they are the gods' answer to it - namely, 'go away and stop bothering us; if living hurts too much, you can die.'
"Pleased with his little joke, the God of Darkness kept these creations as pets. When the gods left - deeming Remnant a failed experiment, unworthy of further investment - the creatures of Grimm roamed free, to prey on all those who would come after."