Gunpowder Monk

Secluded in the mountains of Sarlona, a sect of Kalashtar warrior monks have long taken refuge from their enemies. After being hunted to near extinction by their ancient enemies, the elders were gifted a vision from their guiding spirits, a vision of war fueled by fire and smoke. Desperate, and in their final hour, the Kalashtar used this vision to manufacture the order's first gunpowder weapons. Armed such in their last mountain holdfast, the besieged monks rained fire and iron down upon their foes driving them back to whence they came.

The Way of Gunpowder

You gain proficiency in Firearms and smithing tools, as well as the knowledge and skill required to craftthem. In addition your crafted firearms count as monk weapons for you.

Gun-Fu

When surrounded by foes you may spend one ki point to enter into a state of intense focus and awareness that lasts for 1 minute or until you lose consciousness. In this state you gain +1 AC for every humanoid foe you can see within 5 feet of you. 

What's Yours Is Mine

When you hit with an unarmed attack, you can use one ki point to attempt to wrest an opponent's weapon from his hands. Your opponent makes a DC 17 strength or dexterity saving throw. If they fail, you may take your opponent's weapon and can use it on your next attack. On a success the creature retains its weapon, and may immediately make a single weapon attack against you.

Quick Hands

When an opponent hits you with a melee weapon attack, you may use your reaction to spend one ki point to negate the attack's damage by half and force your opponent to make a strength or dexterity DC 17 saving through. If they fail, you wrest the weapon from your opponent's hand, and can immediately make a single attack with that weapon. If your opponent succeeds, they retain their weapon, and may attempt that attack again. 

Maximum Pain

When targeted by a ranged attack, you may spend 1 ki points to attempt to dive out of the way. Make a Dexterity saving through, on success all of that opponent's attacks miss you this round, and you dive up to 10 feet in any direction. In addition you may spend 2 additional key points to make a full attack action while diving through the air. You land prone and must use half your movement speed to stand.

Ballistic Mortar Cannon

You have mastered the ability to use mortar cannons to deliver explosive rounds with deadly precision. You may use your action to set up, aim, and ignite the fuse on a mortar cannon. The fuse takes one round to burn, and will go off at the end of your next turn. This explosive ballistic projectile has a range of 30-360 feet and, deals 8d6 fire damage in a 20ft radius from the point of impact on a failed DC 17 dexterity saving through, and half as much on a success. You must craft these projectiles, and may create one per long rest. 

Bullet Time

Once per short rest, as an action you may spend 5 ki points to rain a hail of bullets upon your enemies with pinpoint accuracy. You may make one attack with a firearm for each enemy you can see in range of you. Make each of these attacks with advantage.