Acrophobia (3.5e Flaw)
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You are afraid of heights.
Effect: Whenever you can see that you are within 5' of the edge of a drop of 15' or greater, you become frightened and must move away from the edge as best you can. You Climb such heights at half normal rate (that is, one-eighth your speed). If you fall from a height of 15' or higher, you become cowering for 1d6 rounds.