You move at half speed in difficult terrain— moving 1 foot in Difficult Terrain costs 2 feet of speed—so you can cover only half the normal distance, usually with a Walking Speed .

The Game Master can determine if a space is Difficult Terrain for a creature if the space contains any of the following ideas:

1. Creature that isn’t Tiny
2. Furniture that is Small or larger
3. Heavy snow
4. Heavy undergrowth
5. Ice
6. Liquid that’s between shin- and waist-deep (any deeper and you need to Swim)
7. Narrow opening that is sized for a creature one Size smaller
8. Pit or another gap of 2–5 feet
9. Rubble
10. Slope of 20 degrees or more