Difficult Terrain
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halves the Movement Speed of creatures moving through it, requiring 
2 m / 7 ft of movement to move 1 m / 3 ft through this type of area.
Examples of difficult terrain include:
Twisting Vines, 
Web, 
Spikes, 
Mud, 
Grease, 
Ice, 
Lava, 
Deep Water and many other types of Surfaces.- Non-surface areas created by spells such as
. - The overgrowth created by
uniquely quarters movement speed.
The extra expenditure for movement also applies to 
. Furthermore, Weapon actions which require expending movement do not function while the character is affected by Difficult Terrain. These include 
, 
, and 
.