# Speedy *Source: Player's Handbook (2024) p. 208* **Prerequisite**: 4th; Dexterity 13 or higher or 4th; Constitution 13 or higher You gain the following benefits. **Ability Score Increase.** Increase your Dexterity or Constitution by 1, to a maximum of 20. **Speed Increase.** Your [Speed](/Rules/Source/variant-rules/speed-xphb.md) increases by 10 feet. **Dash over Difficult Terrain.** When you take the [Dash](/Rules/Source/actions.md#Dash) action on your turn, [Difficult Terrain](/Rules/Source/variant-rules/difficult-terrain-xphb.md) doesn't cost you extra movement for the rest of that turn. **Agile Movement.** [Opportunity Attacks](/Rules/Source/actions.md#Opportunity%20Attack) have [Disadvantage](/Rules/Source/variant-rules/disadvantage-xphb.md) against you.