Shinobi

You have been highly trained in the art of the assassin and have been used to fulfill contracts, guard convoys, and hush some people who have been too loud. Shinobi are mostly found in traditional clans within Greyhawk and are rarely found anywhere else unless they have been hired for jobs. The art of the Shinobi was invented by the original member of the Kawazaga clan known as Gi-Hun Kawazaga and he studied while inventing this art to make killing more efficient and swift allowing you to craft artillery that is used for destroying enemies in quick swift blows with your blade, bow, or whatever type of instrument you use in your killings.

Sudden Disappearance.

At level three you can spend a free action once per turn in any unoccupied and concealable space within your movement speed to take the hide action.

Kunais

At third level you are able to craft daggers during a long rest, you can make an amount of Kunais equal to five times your proficiency bonus. When you take the attack action you can use your bonus action to throw one of these Kunais as a bonus action, on a hit you are also able to throw a kunai as a free action. On a hit the target's movement speed is halved until the end of their next turn. These use daggers as their stats.

Smoke Charges.

At level nine when you take a long rest you make an amount of small smoke capsules equal to your proficiency bonus. These can be broken as a bonus action and upon being broken they erupt in a 30ft radius and all creatures except you must make a constitution saving throw (DC 8 + dexterity modifier + proficiency bonus) and if they fail they are blinded for one minute, they can repeat this saving throw at the end of each of their turns. Alternatively you can use it to cast the Misty Step spell, you must choose one or the other of the effects listed when making them. When attacking blinded targets you are able to use your sneak attack against them multiple times.

Hidden Bombs.

At level thirteen when you take a long rest you make an amount of small explosive charges equal to double your proficiency bonus. Five or less of these can be thrown as an action and have a range of 5/150ft range with dexterity as the weapon's modifier (count as ranged weapons). The explosive have advantage on the attack rolls when concealed and do 1d6 + dexterity modifier + proficiency bonus force damage.

Concealed Weaponry.

At seventeenth level when you take a long rest you can modify one ranged or finesse weapon, if it is a ranged weapon it must have the loading property and must not have the heavy property. When you modify your weapon it is concealed and when you attack with it you can make your next attack with advantage and does an extra +10 damage, once it is used this way it is no longer concealed and can be re-concealed as a bonus action.