I will be conducting a DnD party for one player. Help me write a big and detailed text in which I will talk about the world, its inhabitants, famous NPCs (who, from where, what they want), quests (purpose, causes, relationships) that await him and local factions (significance, goals, prevalence, ideology). Here are my sketches of the adventure:

Genre: Epic fantasy
World: Glittering Frostlands (Frozen tundra)
World's wonder: The creation of the eternal flame
World's disaster: Dragon’s reign
Main quest: Defeat the dragon (quest-giver: King Alaric)
Side quests: Rescue a stolen child (quest-giver: Druid Niamh) and Escort a caravan (quest-giver: Warlord Ragnar)
Main enemies: Brimstone Horde (Orc horde)
Main allies: Order of the Radiant Heart (Knight’s Order)
You start in the witch’s hut.