Terrain

Terrain represents the different land features and barriers inside expedition maps. Passable terrains deplete sanity to travel across: more difficult or treacherous terrain costs more sanity. Any travel leg has a base cost of 5 sanity (on standard difficulty) plus the costs associated with each hex's terrain type. Hovering over terrain reveals its type, and potential routes display their costs when charting course.

Tools & Expertise

Some items and perks can stack effects to greatly reduce the sanity travel cost for certain terrains. The following table indicates these particular terrains and the items/perks that affect their cost.

Terrain	Item	Perk
Deep Snow	Snowshoes	Arctic Explorer
Desert	Water	Desert Explorer
Hills & Plateaus	Climbing Gear	Climber
Shallow River	N/A	Waterproof
Sulfur Swamp	Rope	Waterproof
Swamp	Rope	Waterproof
Thick Jungle	Machete	Jungle Explorer

Passable Terrain

Image	Terrain	Travel Cost
	Beach	1
	Bushes	1
	Cactus Forest	3
	Crystal Forest	4
	Deep Snow*	10
	Desert*	10
	Drylands	1
	Frozen Plains	2
	Giant Mushrooms	2
	Giant Skeleton
	Grasslands	1
	Hills*	15
	Light Jungle	2
	Pack Ice	4
	Plateau*	25
	Scorched Earth	3
	Shallow River	4
	Snow Forest	3
	Stone Forest	3
	Stone Forest (Desert)	4
	Sulfur Lake (Shallow)	4
	Sulfur Swamp*	10
	Swamps*	10
	Thick Jungle*	8

*cost may be reduced by terrain-specific item or perk.

Hazardous Terrain

Image	Terrain	Conditions
	Fire	Each hex of fire traveled on costs 10 Sanity, and has a 1-in-7 chance of killing a companion. If a companion dies, there is a 25% chance another companion will get the pyromaniac ailment. If your explorer is alone, (s)he will be killed and the game will end.
	Fumarole Gas	Each hex of gas traveled on reduces each of your characters' health points by 2. While not immediately deadly, this will often cause infected wounds.
	Geyser Water	All shallow water surrounding a geyser will periodically be drowned, potentially "washing away" the group, which will be moved to the nearest land and lose several items or a companion (your explorer will always survive, even if alone).
	Mosquito	Afflicts one humanoid companion with malaria (80% chance) or jungle fever (20% chance). Explorers and non-humanoid companions are immune.
	Sand Storm	Disrupts travel and transports the group a few hexes away. Adds ~3 days to the journey.

Note: The spreading effects such as fire and gas are also known as "sprawls".

Impassable Terrain

Image	Terrain	Conditions
	Arctic Sea	Swallows up Pack Ice after the party travels across. Travelling in the dog sled prevents this.
	Chasm	The chasm shrine curse will expand outward, instantly killing the party if they don't flee fast enough.
	Fumarole	Periodically erupts, engulfing the surrounding area in toxic fumes that can poison the group, stealing sanity and potentially wounding or even killing companions.
	Geyser	Periodically erupts, drowning the surrounding Shallow Water and potentially "washing away" the group, losing sanity and items.
	Mountain	The mountain shrine curse will sprout dozens of impassable mountains, potentially blocking routes and even destroying locations. Can be blown up with dynamite (costs -1 Standing)
	Mountain Face	The mountains with a face carved on them may be hidding temples behind that you can discover by blowing up the mountain with dynamite. If you are carrying a temple pendulum, it will vibrate if there is indeed a temple inside the mountain face.
	Magnetic Mountain	Causes the compass to point towards it instead of the pyramid if the party travels close enough. Can be blown up with dynamite, eliminating its effect. (costs -1 Standing)
	River	The river shrine curse will spread outward, following the group for several days. Permanently impassable and has the same effect as geyser water if it catches the party (see above).
	Sulfur Lake	Always impassable. Cannot be removed.
	Void	The void shrine curse will spread slowly but endlessly outward, eventually swallowing the entire map and potentially killing the group.
	Volcano	Periodically erupts, engulfing the surrounding area in fire that steals sanity, items and can wound and even kill companions.

Tips

• Plateaus and hills have the highest base sanity cost, but only to climb up them. It costs only 1 sanity per hex to travel along their peaks.
• The Impetus perk reduces the base travel cost of all travel legs by 25%
• Remember that the effects of items and perks can stack to reduce even more travel cost.