Speedster

4th Level Feat, Dexterity or Constitution 13+

Repeatable: No   You possess exceptional speed and stamina, granting you the following benefits:   Ability Score Increase. Increase your Dexterity or Constitution score by 1, to a maximum of 20.
Speed Increase. Your Speed increases by 10 feet while you aren’t wearing Heavy Armor.
Dash Over Difficult Terrain. When you take the Dash Action on your turn, Difficult Terrain doesn’t cost you extra movement for the rest of that turn.