Comments to the topic PBEM and Single Player Balance Mod v1.3: one of the last few major updates
v1.3 is the first of the v1.3x update: it significantly changes mobility over Water, altering the relative advantages of Swimming, Floating and Flying units, modifies the costs of strategic spells to make non-summon spellcasting more viable across the board, and pushes the cursor further in favour of production vs mind-control. These change massively impact the game. As usual, it also improves description of skills, abilities, etc. to improve player experience.