Versatile Weapon Mastery

Cobalt’s draconic face split into a fanged grin as the wagoneers scattered from the exploding ammunition raining down around their caravan. One more arrow ought to make them flee, she thought. Another explosive shot, or perhaps a poison tipped arrow? Her grin cracked into a menacing chuckle. The answer is, of course, to use both.

Versatile Property.
Versatile weapons can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.

Weapons With The Versatile Property:
-Battleaxe, Kusarigama, Longsword, Nunchaku, Quarterstaff, Spear, Trident, War Pick, Warhammer.

Tier 1 Advanced Techniques.

Quick Parry

Prerequisites: martial level 2, proficiency with at least one Versatile weapon
When a creature makes a melee attack roll against you while you wield a Versatile weapon, you can use your reaction to add your proficiency bonus to your AC against that attack, potentially turning a hit into a miss.

Weapon Focus

Prerequisites: martial level 2, proficiency with at least one Versatile weapon
You can use a Versatile weapon as a spellcasting focus, and you can use the hand in which you hold a Versatile weapon to perform the somatic components of spells.

Tier 2 Advanced Techniques.

Superior Strikes; Versatile

Prerequisites: martial level 6, a tier 1 Versatile advanced technique
You can perform a superior strike with any weapon that has the Versatile property.

Tier 3 Advanced Techniques.

Heavy Striker

Prerequisites: martial level 10, a tier 2 Versatile advanced technique
When you attack with a Versatile weapon using both hands, the size of the weapon's damage die is increased by two steps, rather than one (maximum 1d12)

Shield Bash

Prerequisites: martial level 10, a tier 2 Versatile advanced technique
When you take the Attack action and hit with a Versatile weapon while wielding a shield, you can use a bonus action to make a melee weapon attack roll using your shield against the target. On a hit, the target takes 1d4 bludgeoning damage and must succeed on a Strength saving throw or fall prone. Creatures more than one size larger than you automatically succeed on this saving throw.

Swift Striker

Prerequisites: martial level 10, a tier 2 Versatile advanced technique
If you take the Attack action on your turn and only attack with a Versatile weapon wielded in one hand, you can attack with that weapon one-handed again as a bonus action. You do not add your ability modifier to the damage for this bonus attack, unless that modifier is negative.

Tier 4 Advanced Techniques.

Dual Maneuver

Prerequisites: martial level 14, a tier 3 Versatile advanced technique
When you take the Attack action and hit a creature with a Versatile weapon wielded in one hand while your other hand is free, you can attempt to grapple that target as part of that same action.

Guard

Prerequisites: martial level 14, a tier 3 Versatile advanced technique
While you wield both a shield and Versatile weapon, your ability to deflect attacks is second to none. As a bonus action, you can grant yourself a +1 bonus to AC until the start of your next turn, and opportunity attacks against you have disadvantage until then.

Very Heavy Striker

Prerequisites: martial level 14, a tier 3 Versatile advanced technique
When you attack with a Versatile weapon using both hands, your critical hit threshold is reduced by 2.