Velocity Gate

You create a wall of energy that slows down objects and creatures that enter from one side and speeds up those that enter from the other. You choose which side of the wall is the slow side and which is the fast side when you cast the spell. The wall is 60 feet long, 20 feet high, and 1 foot thick, and it can be shaped in any way you choose. It lasts for the duration of the spell or until it is dispelled.

Any creature or object that passes through the wall from the slow side to the fast side gains a burst of speed and doubles its movement speed until the end of its turn. Any creature or object that passes through the wall from the fast side to the slow side has its movement speed halved until the end of its turn.

In addition, any projectile or thrown weapon that passes through the wall from the fast side to the slow side has its damage reduced 2d6, while any projectile or thrown weapon that passes through the wall from the slow side to the fast side has its damage increased by 1d6.

The wall is opaque and blocks line of sight, but you can choose to make it translucent if you prefer.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, the slow penalty increases by 2d6 and fast boost increases by 1d6 for each level above 5th.