
You have mastered ranged weapons, reacting to every opening an enemy presents. You gain the following benefits:
- Enemies either prone or within 5ft no longer cause disadvantage and they take additional damage equal to your dexterity modifier when hit.
- Enemies trigger an opportunity attack when they enter or exit any space within 10ft of you.
- If you or an ally within 30ft are the target of a ranged attack (hit or miss) you may use your reaction to return fire.
- If your ranged attack brings an enemy to 0 hp the projectile penetrates, traveling an additional 5ft and any creature occupying that space takes damage equal to your dexterity modifier.

Updated https://www.dndbeyond.com/feats/270131-ranged-combat-master