Most at home under the open skies and with vast stretches of grassland before them, Plains Runner Druids are born to traverse such landscapes with rapidity and ease. The gift of the plains is the gift of unimpeded motion, and whether they make their home on the frigid steppe or the sweltering savannah, Plains Runners feel this freedom pound from their hearts with each exhilirating step.
At 2nd level, your speed increases by 10 feet. Whenever you willingly move at least 30 feet in a straight line on your turn, you may choose to move up to an additional 10 feet for free in the same direction. This additional movement counts toward the next 30 feet you must move in order to gain this bonus again, but none of the movement which preceeded it does.
Also at 2nd level, you may Dash as a bonus action, but you may only travel in a straight line when you do so using this feature. In addition, when you take the Sprint action, you may turn up to 45 degrees if you have previously moved at least 30 feet in a straight line.
At 6th level, you always have the expeditious retreat spell prepared. It counts as a druid spell for you, and does not count against the number of spells you can prepare. When you cast this spell, you may choose to target a number of creatures equal to your proficiency bonus you can see within 60 feet of you. Once you have modified the spell in this way a number of times equal to your proficiency bonus, you may not do so again until you finish a long rest.
At 10th level, the number of feet you must move in order to gain bonus speed from the Open Fields feature or before you can turn while sprinting is reduced to 20 feet. In addition, you gain an expertise die on Dexterity saving throws.
At 14th level, you can spend your reaction to move up to your speed. In addition, you no longer need to move in a straight line when you Dash as a bonus action, and the expeditious retreat spell no longer requires concentration for you.