Dungeons & Dragons 2024 (D&D) Feat: Enemy in Motion (Combat)

A lifetime spent wandering lets you judge when others’ movement works to your benefit. When you make an attack roll against a creature or make a saving throw against a creature’s attack, spell, or ability, you can use a Reaction to have Advantage on the attack roll or saving throw if that creature moved since the end of your last turn. You can use this feature a number of times equal to your Proficiency Bonus, regaining all expended uses when you finish a Long Rest.

Moving Insight. If you take this trait twice, Enemy in Motion also lets you use your Reaction to affect an ally's attack roll or saving throw if your ally is within 30 feet.