Master of the Great Blade

You are master of two-handed swords, peerless in your brutality and grace. Your training and dedication has resulted in a permanent benefit to your physical prowess, and your superior skill with a variety of long-bladed weapons allows you to switch between three specialized stances.

• Increase your Constitution, Strength, or Dexterity score by 1, to a maximum of 20.
• While you are holding a greatsword or similar two-handed sword, you may use a bonus action to adopt, or switch between, one of the following stances once per turn:
  
  Goliath's Reach: You adopt a high and extended guard to dominate the battlefield. Your reach with Weapon Attacks is extended by 5ft. While in this stance, you suffer disadvantage with attacks made against enemies within 5ft, and enemies that make attacks against you within 5ft have advantage.
  Knight's Balance: You adopt a reserved and versatile stance to pivot between slashing and bashing. When you take the Attack action and attack with only a greatsword, you can use a bonus action to make a melee attack with the pommel or guard of the weapon. This attack uses the same ability modifier as the primary attack. The weapon's damage die for this attack is a d4, and it deals bludgeoning damage.
  Goblin's Grasp: You grip the ricasso or otherwise choke up on your blade to exploit the vulnerabilities of a disabled opponent. When you take the Attack action against a Grappled opponent, you have Advantage on all attacks. Prone foes who attempt to regain their feet within your reach must expend their full movement to do so while in this stance. You have disadvantage against all enemy attacks made outside your reach while in this stance.