Gadgeteer Class

Gadgeteers a group of people who specialise with inventing new technologies for the use of combat. Some Gadgeteers build exoskeletons to give them more strength and also enhance weapons with special devices that can cause a sword to emit electricity, magnetic field ad many other wild ideas.
Class features:
Hit Dice:1d10 per Gadgeteer level
HP at 1st level: 10 + Constitution mod
HP at higher levels: 1d10 + con modifier per Gadgeteer level after 1st.

Proficiencies:
Armour: All armour, shields.
Weapons: Simple weapons, Martial weapons, Pistols, Rifles, Hand Crossbows.
Tools: Engineer's Toolbox
Saving Throws: Intelligence, Constitution, Dexterity.
Skills: Engineering and choose two from Acrobatics, Athletics, History, Intimidation, Investigation, Medicine, Perception, Slight of hand, Stealth, Survival.

Archetypes:
Steam Warrior:
You start with an exoskeleton that gives you +1 ac and advantage on athletics rolls
Gunsmith:
+2 to hit roll when using firearms
Grenadier:
You gain advantage to creating, setting, disarming and throwing explosives.

Invention:
You can invent almost anything depending on the materials around you from clock work to Tesla shock gauntlets as much as your dungeon master allows.