Updated for version 10.7

Ai made more aggressive all around and will lust for the blood of the player and other factions alike. More armies and navies. Raised Ai defensive attitudes

Ai will spend more money making armies. Better Naval recruitment. Ai will attack in force. Ai a bit more focused on human player.
Recommended difficulty is Very Hard Campaign.

Shifted Ai priorities more toward the human player. Ups the difficulty.

Increased chance of Ai to attack all enemy forces and settlements. Better chance of Ai to help their allies. Reduced chance of Ai sending single ship to blockade enemy ports. Best to start new game.

Added new AI strategic components and AI will really focus on taking territory-they will be more expansive.AI will build more armies. Best to start new campaign

AI will defend regions better and attack War regions more with more armies. Battles will be tougher

Larger upkeep penalties when campaigning in enemy regions. Better AI prestige on higher fame levels.

Ai will make more armies when at war.