Timetwist

You create a 15-foot sphere of time distortion, centered on yourself. It follows you as you move and lasts until the end of your next turn. While inside the sphere, your movement speed increases by 1d10. Additionally, all other creatures in the sphere have their movement speed reduced by the number rolled until they leave the sphere.

While the sphere is active, you and any creature outside the sphere have advantage in all melee attacks on creatures inside the sphere (other than you). Creatures other than you inside the sphere automatically fail all Dexterity checks while inside the sphere. All creatures inside the sphere (including you) cannot use loading ranged weapons except against other creatures inside the sphere. You take half damage from ranged weapons while inside the sphere.

After casting this spell, you may take a second action this turn.

At higher levels: for each level used to cast this spell after 5th, increase the size of the sphere by 10 feet.