Path of the Metalgear

This barbarian use his brain to upgrade and create armor to give them more powers.

Raging Mechanic

Starting at 3rd level when you choose this class, you are proficient with tinker's tool if you aren't proficient with them already.

Metalgear Armor

At 3rd level, you choose a part of your body to be upgraded with special armor. You gain benefits depending on the armor type you choose (You may only choose one armor type). You can change the armor type you are using every long rest or keep the same (You must have a Tinker's tool while you are changing the armor type).

Arms

 Unarmed strikes using your armored arm has a bonus to damage equal to your Intelligence modifier.

Body

Your Armor Class gains a bonus equal to your Intelligence Modifier. You also have resistance to poison.

Head

You gain darkvision for 30ft. You have advantage on Wisdom (Perception) checks relying on seeing, hearing and smelling.

Legs

When you do a long or high jump, you can add your Intelligence modifier to the jumps. While walking on Difficult terrain, it does not cost anything. 

Improved Metalgear Armor

At 6th level, you gain additional benefits from the armor types from the Metalgear Armor feature.

Arms

The damage die for your unarmed strikes becomes a d6. The damage of your unarmed strikes is magical to overcome resistances and immunities. 

Body

You can use your reaction to gain an extra +2 to your Armor Class. You can only use this feature equal to your Intelligence modifier. Every long or short rest you regain this feature. 

Head

You now gain darkvision for 60ft. You have advantage on Intelligence based checks. You can add half (rounded down) your Intelligence modifier to checks you are proficient with. You can cast Identify, your Intelligence is your spellcasting modifier, you can cast this spell equal to your proficiency bonus. You regain uses every short or long rest.

Legs

You have a flying speed equal to six times you Intelligence modifier. If you are in the air at the end of your turn, you fall and take damage ignoring resistance and immunities.

Knight of Metalgear

At 10th level, it now only takes an action to change the armor type you are using. While you are raging and have a armor from the Metalgear Armor feature, you can add your Intelligence modifier to damage

Master of Metalgear

Starting at 14th level, you can wear all the armor types from the Metalgear Armor feature but you don't gain the features of the Improved Metalgear Armor feature.