Unicarn

Allows you to import/export campaign maps, give players negative starting gold, give starting gold in increments of 10, and add screen filters

Disables the main menu music.

Adds two more digits to hit point number badges, rounding to the nearest 5 instead of the nearest 10.

Grants access to hidden content in the map and campaign editor.

Unlocks hidden music and allows the swapping of Ambience and Music, which allows you to have two music tracks or two ambience tracks running at the same time in a cutscene. Can also have ambience running during gameplay instead of music.

Makes flagstone easier to see in desert and ice biomes.

Makes forest trees smaller and does not allow decorations to go on top of units, making the game more readable. (Out of date)

Removes Deep Sea and Beach restrictions, allows the full layering of terrain, and unlocks the Volcano and Sky tiles

Changes the color of Mercia's hair to make it easier to tell what team Mercia's on at a glance. (Out of date)