Homebrew Dreadnaught Species Details

A walking coffer with a bearly living human inside, kept alive by magic healing and the coffer filled with a healing concoction, these creatures are said to be nigh immortal, the only down side is that if the coffer is destroyed so is the corpse. the coffer is housed with in a mechanical tank that allows one ranged (firearm based) and one melee (for balance reasons). as such artificers are the only beings able to heal a dreadnaught, a machine is hard to call flesh.
disadvantages:
cannot fit into human sized anything, and does not have the ability to be on non reinforced boats.
magical healing and potions do not work, only artificers can "heal" dreadnaughts
no death saves.
Modifiers:
str:+2
con:+2
weight:
base (unchangeable): 10 to 12 tons (22,046 to 26,456 lbs.)
height:
between 3.7 meters (12 ft.)-7.5 meters(25 ft.)
Huge creature
language:
common
Weapon Proficiencies:
martial weapons, simple weapons, firearms
armor proficiencies:
heavy armor
resistance:
cold
slash (does not stack with rage)
Skill proficiencies
only strength based skills are acceptable and intimidation

Dreadnaught Traits

as a coffer you will gain

inhuman strength

 +3 on strength checks and saves also advantage on moving objects smaller that himself.

water breathing

you can breath underwater. I do not know how this would be misenturprated but because you are in a life support coffer, you dont use your lungs.

loyal till the end

When Frightened you don't suffer any movement penalty and can stay within ranged of the target, but still have disadvantage on attack rolls against the target

Darkvision

If you have Darkvision, you can see in Dim Light within a specified range as if it were Bright Light and in Darkness within that range as if it were Dim Light. You discern colors in that Darkness only as shades of gray, but because of the lights usually on the dreadnaughts (up to the dm's discretion) you have 30 ft of Darkvision except it is good for everyone and you can still see color. (is activatable in character and can have a cool down if dm needs)