Accelerate/Decelerate (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||concentration up to 1 round|
You make a minor change to the way time interacts with a single creature or object within range. Until the end of your next turn, the target’s speed is reduced or increased by 10 feet. Likewise, if the creature falls 20 feet or less before the spell ends, it lands on its feet and has resistance to any falling damage it takes.