Zones

Zones are parts of the world divided by biome, average level, cities, etc.

Each zone has its own special types of monsters, different architecture, and NPCs. The average level of the zone determines what items merchants will sell, and quests are also dependent on this zone level.

The level of a zone is usually in the range of 10 levels, with a few exceptions. For example, the Aspen forest starting zone contains items, quests, etc. for levels 0-10. Some zones have the same average level as others, in which case everything is spread across all those zones.