Firecracker

Long ago an alchemist blew their lab sky high after discovering the process to make what we call today gunpowder. Rogues who use this miraculous and explosive substance have sacrificed their stealthy ways for a more potent solution 

Level 3: Demolitionist

At 3rd level, you learn how to create small explosives and employ them in combat. You gain proficiency in Alchemist Supplies and using these tools you can make Black Powder Bombs.

At the end of each long rest, so long as you have access to your alchemist supplies, you produce a number of Black Powder Bombs equal to your intelligence modifier + your proficiency bonus. These bombs become inert if not used by the end of your next long rest.

You are proficient with Black Powder Bombs and require a ranged weapon attack roll to use, creating a loud localized shockwave dealing 1d6 force damage, dealing double damage to structures. These bombs can trigger your sneak attack feature and always apply sneak attack damage to structures 

Level 3: Explosive Escape

Also at 3rd level, when a creature hits you with a melee weapon attack, as a reaction. Detonate a Black Powder Bomb that you have on you, That creature must make a Dexterity Saving Throw against your Firecracker Save DC (8+Proficiency Bonus + Intelligence Modifier). On a failed save you and the creature are pushed 10 ft apart and that creatures movement speed is reduced to 0 until the end of its turn

Level 9: Remote Trigger

At 9th level. You have developed a remote that allows you to trigger your Black Powder Bombs from a great distance, As an action, you can trigger a Black Powder Bomb as long as you are within 100 feet of it. Your Bombs have been upgraded now when you use your Black Powder Bombs creatures within 10 ft of the bomb must make a Dexterity Saving Throw, On a failed save, each creature takes 2d6 force damage or half as much on a success

Level 13: Explosive Suprised

Starting at 13th level, you mastered the techniques to conceal and trigger explosions to exploit your foes weaknesses. Creatures have disadvantage on saving throws against your Bombs if they are surprised or cannot see the bomb

Level 17: Pyrotechnician

At 17th level you become a savant at creating and deploying Black Powder Bombs. Your Black Powder now deal 3d6 force damage, You can restock your Black powder Bombs on a short rest, but must complete a long rest before you can use this feature again. 

Additionally when you are reduced to 0 hit points you can, as a reaction, cause all the Black Powder Bombs you have on you to Detonate, Creatures within 10 ft of you must make a Dexterity Saving Throw. or take 1d6 per bomb detonated force damage, or half of much on a successful save. You take no damage from this explosion