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Dynamic NPC Encounter Groups
The world is not static and unchanging – every day is not ‘groundhog’ day. Events occur that can completely change the population of a zone or the population of a group of NPCs within a zone (and the rarer the event, the rarer the rewards -- many exotic items can only be obtained when one of these zone events occur). An example: after you kill some key mobs guarding a hill giant camp, this triggers a zone event that loads up an invading force of Storm Giants who then proceed to attack the Hill Giant camp.