You were created to have remarkable fortitude, represented by the following benefits:

You have advantage on saving throws against being poisoned, and you have resistance to poison damage.
You don’t need to eat, drink, or breathe.
You are immune to disease.
You don’t need to sleep, and magic can’t put you to sleep.

When you take a long rest, you must spend at least seven hours in an inactive, motionless state, rather than sleeping, with increased wisdom . In this state, you appear inert, but it doesn’t render you unconscious, and you can see and hear as normal. if anything is spotted you can exit this innactive state, but it does not count as a long rest, and will have to activate another long rest for abilities to be recharged.

While in this state, you gain:

• +2 wisdom
• +1 strength

Due to your use as a heavy force, you were constructed with advanced metals and alloys, but it cannot be increased by any form of armor.

you can, however, modify your armor if you have enough resources, 

some things you can modify your armor with is

• Bone, as make-shift spikes you can magically weld to your hull.
• You can paint your armor to match the surroundings, given you have enough paint.

you can unlock further options at further levels,

level 3,

• Armor plates, you can salvage off enemies and from armor that is bought
• Metal spikes, that you can strip from armor plates and weapons.

level 5,

• if you have bone spikes or metal spikes you can mantle heads of enemies you have killed as a way to intimadate foes.

Your Constitution score increases by 2, and one other ability score of your choice increases

You gain one skill proficiency and one tool proficiency of your choice.
chosen tool will be equipped as your secondary arm, but can be swapped for a regular arm.

you can choose one common language to read and speak in, and one language of your choice.

A built in magical cannon that can cycle through different spells per use.
can replace the normal arm, or can be replaced by another tool or arm.

Once per day, you must take a long rest to recharge the magical cannon, or else it will not work properly and you will gain disadvantage to attacks with the cannon, and over the course of the next day, you will gain more disadvantage until you are unable to use it.

starting disadvantage

• 2d6

second disadvantage

• 2d10

third disadvantage

• 2d16 damage

Spell Damage

when using the cannon, you can calculate spell damage regularly, plus 1d6 for total damage

Usage before disadvantage

you can fire the cannon 5 times per day before a long rest is required to fully recharge it and not recieve disadvantage.
you must wait 4 turns during battle after every use of the cannon to re-use the cannon.

Dex Disadvantage

while the magical cannon is equipped, you gain a disadvantage to dexterity checks.