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Difficult Terrain halves the Movement Speed of creatures moving through it; that is, a creature must spend 2 m of movement to move 1 m through an area of difficult terrain.
Examples of difficult terrain include:
- Dense foliage, uneven rocks, certain staircases, and other non-flat areas
- Water and other liquids
- Most types of Surfaces
- Areas created by spells such as
Hunger of Hadar and 
Spike Growth