surge step

you move with magically enchanced speed trailed by harmless surges of electricity beneath your feet you gain extra movement for current turn the increase equals your speed after applying any modifiers plus an additional 10 feet with a speed for 30 feet for example you can move up to 70 feet on you turn by casting this spell additionally opportunity attacks against you have disadvantage until your turn ends 

this spell increases your movement by an additional 10 feet when you reach 5th level (your speed + 20 feet) 11th level (your speed + 30 feet) and 17th level (your speed + 40 feet)