Pyrojunkie

You can create grenades using magical prowess, you can then use your next action to detonate them at enemies, you also have resistance to fire damage, you can also 

Grenadier

You can make grenades with a bonus action, these grenades have a variety of effects and abilities 

 

Clockwork creature

Once per short rest, you can gain advantage on An attack roll. You also have advantage on all strength checks and saves. You can also use a bonus action when you make an unarmed strike against a creature, you can use a bonus action to activate a piston in your arm and deal an extra 1d8 blugeoning damage

Overdrive

You can put your equipment into overdrive, gaining advantage on your next attack roll, in addition your speed is doubled and you have advantage on dexterity saving throws

Mechanically inclined

You’re now proficient with tinker’s tools and smiths tools. In addition you have advantage on investigation checks that involve you finding out the inner workings or function of a magic item or weapon

steampunk

you can weaponize steam power and enhance your attacks, all unarmed strikes deal an extra 1d4 force damage, and they heal him for 1d10 damage for three rounds, you can only do this once per short rest