Great Cleaver

Your mastery of the greataxe allows you to deliver devastating strikes capable of splitting your foes in two. You gain the following benefits:

Axe Master. While you are wielding a greataxe, your slashing damage ignores resistance to slashing damage.

Cleaving Blow. When you take the Attack action on your turn and are wielding a greataxe, you can forgo all attacks granted by that action to make one Cleaving Blow. You may do this up to 3 times per long rest. Make a single greataxe attack roll with advantage. This attack scores a critical hit on a roll of 17–20. On a hit, the target is vulnerable to the attack’s slashing damage for that attack, unless it is immune to slashing damage.