Way of the Steadfast Guardian

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3rd

When you choose this tradition at 3rd level, your special training in great weapons allows you to gain proficiency in up to 3 melee weapons with the 'heavy' property. These weapons are considered to be monk weapons for you. However, you cannot use flurry of blows while wielding a weapon with the 'heavy' property until level 11. When using one of these weapons, you may add the martial arts die on top of the weapon's normal damage effects until the end of your turn, using 1 ki point to do so. Your bonus action attack uses the blunt of your weapon and may use the martial arts die for the damage. Additionally, you gain the Interception Fighting Style. 

Trained Weapons

Choose 3 weapons with the 'heavy' property. These weapons are considered to be monk weapons for you. 

6th

You gain proficiency in Insight if you don't already have it and your passive Insight increases by 5. You gain the ability to knock an enemy prone with the force of your blade when attacking with a weapon with the 'heavy' property, using 2 ki points to do so. Additionally, your great weapons are considered magical for the purposes of overcoming resistances. 

11th

You've spent the time training to expertly wield heavy weapons in each hand. You are able to dual-wield any weapon you have proficiency in with the 'heavy' property. Additionally, for 3 ki points, you can use flurry of blows with a heavy weapon you are proficient in. 

17th

You gain the Duel Wielding Fighting Style. You are so quick with the blade that you are able to make one more attack in a round. You can attack 3 times, instead of twice, whenever you use the attack action on your turn. Additionally, once on each turn, you can use a monk ability that normally costs 1 ki point, without expending a ki point.