Difficulty

Changing the difficulty doesn't actually change the intelligence of the AI, it only changes the bonuses given to the player and computer controlled factions.

Newbie

 * Player
 * +5 on cities and districts
 * -25% expansion disapproval
 * -25% Hero Upkeep
 * -50% Military Upkeep
 * +20% Unit Health, Attack, and Defense
 * +1 FIDSI per Population
 * +2 Base City FIDS
 * +20% City FIDSI Output
 * AI
 * +10 on cities and districts
 * +25% expansion disapproval
 * -10% growth, research, buyout, production, and empire plan cost reduction
 * -1 FIDSI per population

Easy

 * Player
 * +10% City FIDSI Output
 * +1 Base City FIDS
 * -25% Military Upkeep
 * +10% Unit Health


 * AI
 * +10 on cities and districts

Normal

 * No Player bonuses


 * No AI bonuses

Hard

 * No Player bonuses
 * AI
 * -20% upkeep costs
 * +10 on cities and districts
 * -20% expansion disapproval
 * 15% research cost reduction
 * 20% empire plan cost reduction
 * 20% growth, building production, and buyout cost reduction
 * 20% unit cost reduction
 * +0.25 FIDSI per population
 * +50% strategic resources

Serious

 * No Player bonuses
 * AI
 * -35% upkeep costs
 * +10 on cities and districts
 * -35% expansion disapproval
 * 20% research cost reduction
 * 35% empire plan cost reduction
 * 35% growth, building production, and buyout cost reduction
 * 35% unit cost reduction
 * +0.5 FIDSI per population
 * +100% strategic resources

Impossible

 * No player bonuses
 * AI
 * -50% upkeep costs
 * +10 on cities and districts
 * -50% expansion disapproval
 * 25% research cost reduction
 * 50% empire plan cost reduction
 * 50% growth, building production, and buyout cost reduction
 * 60% unit cost reduction
 * +1 FIDSI per population
 * +150% strategic resources
 * +10 and +50% XP on unit creation
 * +50% XP per turn

Endless

 * No player bonuses
 * AI
 * -70% upkeep costs
 * +10 on cities and districts
 * -60% expansion disapproval
 * 30% research cost reduction
 * 60% empire plan cost reduction
 * 60% growth, building production, and buyout cost reduction
 * 70% unit cost reduction
 * +2 FIDSI per population
 * +200% strategic resources
 * +10 and +100% XP on unit creation
 * +100% XP per turn

Editor Notes: I verified all these values in the game code, though there are some values I didn't put up here that may need to be added.


 * The AI At all levels has a 0% chance at getting quests from ruins, and a -40% ruins loot modifier
 * Urkan Spawn rates change based off of difficulty
 * Normal and Below: Default
 * Hard: 30% Bonus
 * Serious: 55% Bonus
 * Impossible: 120% Bonus
 * Endless: 175% Bonus