It’s set in the 1490s because that’s the current era in Forgotten Realms, just like the first games were set in the 1360s because that was the era that was current at the time. It’s not like they actively chose that specific time period for any of the three games.
It’s set in the 1490s because that’s the current era in Forgotten Realms, just like the first games were set in the 1360s because that was the era that was current at the time. It’s not like they actively chose that specific time period for any of the three games.