Powder Monkey

You gain proficiency with Tinkers Tools and Grenades. 

Once per long rest, for 25GP worth of black powder, you may use your Tinkers Tools (DC10) to craft Grenades. On a successful Tinkers Tools check you may craft Grenades equal to your Intelligence modifier with a minimum of 1, rounded down.On a fail you can craft a number of Grenades equal to half your intelligence modifier, minimum of 1, rounded down. On a critical fail you instead take 1d6 fire damage and cannot complete any grenades. 

Grenades(Light): Make a ranged attack against the target. On a hit, the target takes 1d4+your Dexterity modifier bludgeoning damage. Hit or miss, the grenade then explodes. The target and each creature within 5 feet of it must succeed on a Dexterity saving throw against or take 1d6 force + 1d6+your intelligence modifier (Minimum of 1) fire damage.

Grenades can be altered as a bonus action to produce smoke which removes the damaging explosive component. Make a ranged attack against the target. On a hit, the target takes 1d4+your Dexterity modifier bludgeoning damage. Hit or miss, the grenade then explodes. You create a 20-foot-radius sphere of thick black smoke centered on a point within range, the smoke colour can be changed depending on the components used. The sphere spreads around corners, and its area is heavily obscured. It lasts for 10 minutes or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.

Colours:

Crushed Azurite beetle: Blue

Royal Snail Extract: Purple

Bullfrog gut: Green

Bulldog Ant Acid: Red

save DC = 8 + your proficiency bonus + your intelligence modifier

Black Powder spoils easily, Grenades will spoil within 24 hours of creation.