Eras

Eras are the eight periods of history your civilization will pass through. You will advance through eras by researching technologies, advancing an era when you have researched either all technologies in the current era or your first technology in the next era. The attack and defense values for other civilizations are based on their current era, not yours.

Ancient Era
Ancient Era details:
 * Barbarian attack chance: 75%
 * Barbarian strength: 1
 * Other civilizations offense/defense: 2/2
 * Happiness drain per turn: -1
 * Culture Points Multiplier: 1
 * Diplomacy Points Multiplier: 1
 * Might Points Multiplier: 1
 * Production Points Multiplier: 1
 * Research Points Multiplier: 1

Classical Era
Classical Era details:
 * Barbarian attack chance: 75%
 * Barbarian strength: 3
 * Other civilizations offense/defense: 3/4
 * Happiness drain per turn: -1
 * Culture Points Multiplier: 2
 * Diplomacy Points Multiplier: 2
 * Might Points Multiplier: 2
 * Production Points Multiplier: 2
 * Research Points Multiplier: 2