Ancient Dragon Technique

Mimicking the flight patterns of a dragon in combat,  you can move large weapons with surprising fluidity and grace.

You gain proficiency with the Glaive, Halberd and Pike.  When making an attack with one of these weapons, you may use your Dexterity modifier for the attack and damage rolls instead of Strength.

If you’re holding a weapon that this feat gives proficiency with  and another creature hits you with a melee attack, you can take a Reaction to add your Proficiency Bonus to your Armor Class, potentially causing the attack to miss you. You gain this bonus to your AC against melee attacks until the start of your next turn.