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Chapter 8: Playing the Game / Movement / Terrain

Narrow Surfaces

Source Player Core pg. 423
A narrow surface is so precariously thin that you need to Balance (see Acrobatics on page 233) or risk falling. Even on a success, you are off-guard on a narrow surface. Each time you are hit by an attack or fail a save on a narrow surface, you must succeed at a Reflex save (with the same DC as the Acrobatics check to Balance) or fall.