Polearm Master
Prerequisites 4th; Strength 13 or higher or 4th; Dexterity 13 or higher
You gain the following benefits.
Ability Score Increase. Increase your Dexterity or Strength by 1, to a maximum of 20.
Pole Strike. Immediately after you take the Attack action and attack with a Quarterstaff, a Spear, or a weapon that has the Heavy and Reach properties, you can use a Bonus Action to make a melee attack with the opposite end of the weapon. The weapon deals Bludgeoning damage, and the weapon’s damage die for this attack is a d4.
Reactive Strike. While you’re holding a Quarterstaff, a Spear, or a weapon that has the Heavy and Reach properties, you can take a Reaction to make one melee attack against a creature that enters the reach you have with that weapon.
Sources
Player’s Handbook (2024) p. 206