Vision

Vision is a hidden stat that changes how many tiles are uncovered whenever you move, this can be increased by traits such as Magic Vision and Heightened Sense (these traits do not stack normally, your Vision will only increase by 2 only if you have both of these on the same character).

The default amount of tiles that will be uncovered depend on the type of tile that you move to, for example, if you move to a Deep Forest tile which has -3 Vision while you only have 2 Vision then you will only be able to see 1 new tile in each direction (since minimum vision is always 1), but if you move to a Mountain tile which has +2 Vision while you have 3 Vision then you'll discover 5 new tiles in each direction.

Tiles
The Vision stats for each tile are as follows:

Deep Forest: -3

Forest: -2

Deep Sea: -1

Swamp: -1

Air: 0

Lake: 0

Lava: 0

Light: 0

Plains: 0

Slime: 0

Stone: 0

Tundra: 0

Water: 0