Deft Shadow Veil

The Shadowfell manifests around you, bringing you the stealth and speed of one of its assassins. You become invisible until the spell ends. The spell ends if you make an attack or cast a spell. Your speed increases by 10 feet until the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the speed bonus increases by 10 feet for every two slot levels above 2nd.