Skin history:
The valley lived in fear of the roar of a powerful creature. The dragon, like a punishment from heaven, once descended on these lands, since then punishing the people for their sins: Eternal wars, rage and envy. He destroyed their fields and cattle forcing them to die of starvation.
People prayed for forgiveness, repented and bowed at the feet of the great monster. The pleas were heard. The dragon retreats, hiding in the mountains.
After many years, mentions of him remained only in legends, but the inhabitants were still afraid of him, they still heard his majestic roar from the outskirts of the valley.
As soon as they stumble, the punishment immediately overtakes them again.

Tried very hard. Hope you like it :)