You don't need to eat, drink, or breathe.

Instead of sleeping, you enter an inactive state for 6 hours. While in this state, you remain aware of your surroundings and gain the same benefits that a humanoid gains from a Long Rest.

You are immune to the following conditions/damage types: disease, poison, poisoned, psychic Blinded, Paralysis through non-magical means, charmed through non-magical means, and Stunning through non-magical means

You are resistant to bludgeoning damage

You are vulnerable to Thunder, Lightning and acid damage types.

Your hollow chassis contains a reinforced chamber designed to house a willing companion.

As an action, one willing Medium creature within 5 feet of you may enter your chassis, provided your chamber is unoccupied.

While a creature is housed within your chassis:

• The housed creature occupies your space and moves with you.
• The housed creature has Total Cover against effects originating from outside your chassis.
• The housed creature can communicate with you normally.
• The housed creature can exit your chassis as a Bonus Action, appearing in an unoccupied space within 5 feet of you.
• You are considered Piloted.

Piloted
While Piloted, the following rules apply:

The pilot occupies the Aegisframe's space and moves whenever the Dreadnought moves. The pilot cannot willingly leave the Aegisframe's space except by exiting the Pilot Chamber using a bonus action. The pilot cannot use its flying, climbing or burrowing speed while in the Aegisframe.

The pilot has Total Cover against effects originating outside the Dreadnought, unless an effect specifically states it can affect creatures inside another creature or object.

The Aegisframe and the pilot each retain their own initiative, turns, actions, bonus actions, and reactions. Neither creature gains additional actions as a result of being Piloted.

The pilot's movement is equivalent to that of the Aegisframe's. The pilot can use it's movement to move the Aegisframe. If the pilot is forcibly moved, it is immediately ejected from the Pilot Chamber into the nearest unoccupied space.

The pilot can cast spells, activate magic items, speak, and use class features while inside the Pilot Chamber, provided the feature or spell doesn't require the pilot to physically leave the chamber or occupy another space. The point of origin for any spell or feature used by the pilot is the Dreadnought's space unless otherwise specified.

Whenever the pilot takes the Attack, Magic, or Utilize action, it may replace that action with a Aegisframe Action granted by the Aegisframe's species traits, feats, or other features.

The Dreadnought and its pilot are in constant communication and always understand one another while Piloted, regardless of language.

If the Dreadnought becomes incapacitated, is reduced to 0 hit points, or willingly ejects its pilot (no action required), the pilot immediately appears in an unoccupied space within 5 feet of the Dreadnought.

You gain a +2 on your AC +1 on your STR score and +1 on your CON score

• Donning armor requires a Short Rest, during which the armor is welded, bolted, or otherwise integrated into your frame.
• Doffing armor also requires a Short Rest.
• During either process, you must have access to the armor and appropriate tools, such as smith's tools, tinker's tools, or another suitable set of artisan's tools, used either by you or by a willing creature assisting you.

Once integrated, the armor functions exactly as normal until it is removed

Learn actions that can be used in combat or regular scenarios. You, and your pilot can use these protocols as a bonus or a reaction(if stated). Only 1 protocol can be made in a turn.

Overdrive Protocol
Until the end of the current turn:

• Your speed increases by 15 feet.
• You ignore difficult terrain.
• Your next melee weapon attack deals an additional 1d6 force damage.

Guardian Protocol
When a creature you can see within 10 feet is hit by an attack, you can use your reaction to move up to half your speed toward that creature without provoking opportunity attacks. If you end this movement adjacent to the target, you become the target of the triggering attack instead.

Siege Protocol
Make one melee weapon attack. On a hit, the attack deals an additional 1d8 force damage, and the target must succeed on a Strength saving throw (DC = 8 + your Proficiency Bonus + your Strength modifier) or be knocked prone.

Command Uplink

Choose one ally within 30 feet. That ally can immediately use its reaction to move up to half its speed without provoking opportunity attacks or make one weapon attack.

While you are Piloted,  when either you or your pilot makes an attack roll, ability check, or saving throw, the other can use their reaction to grant a 1d4 bonus to the roll.

Bulwark Pattern

Your frame was built to defend.

• You gain proficiency in the Athletics skill.
• Once per turn, when you successfully shove a creature, you can move into the space it vacated without expending movement.

Siege Pattern

Your frame was built to destroy.

• You gain proficiency with martial weapons.
• Once per turn, when you deal damage with a melee weapon attack, you can reroll one damage die. You must use the new roll.

Vanguard Pattern

Your frame was built to advance.

• Your walking speed increases by 5 feet.
• Opportunity attacks against you are made with disadvantage.

Sentinel Pattern

Your frame was built to protect others.

• You gain proficiency in the Perception skill.
• When a creature within 5 feet of you makes an opportunity attack, you can use your reaction to impose disadvantage on that attack.

Dreadnought chainsword: 1d10 + proficiency bonus + Strength modifier
Autocannon: 2d6 + Proficiency + Dexterity modifier

die value increases by 1 at lvl 3 and 5.

You gain a +2 in wisdom. you also learn any language of your choice and you have proficiency in any artisan tools.

Necromancy spells that are casted have no effect on you Physically (Unless they specifically state that they have effects on Constructs).

Abjuration spells that are casted have no effect on you Physically (Unless they specifically state that they have effects on Constructs). 
Reincarnate does retain it's effects on this species.

Enchantment spells have no effect on you physically (Unless they specifically state that they have effects on Constructs)

Mending allows you to regain hit points equivalent to that of 1 of your hit die + your constitution modifier. Heat Metal can be used on you (without the material components) which forces anyone that comes in physical contact with you to take the amount of damage the spell indicates. 

Your chassis contains five Arcane ports capable of integrating magical devices.

During a Short Rest, you can install or remove a spell scroll, magic item, or wondrous item into an empty Port.

A spell scroll of 6th level or higher cannot be installed into a Hardpoint. Additionally, artifacts and legendary magic items can never be installed unless your DM allows it.

While an item is installed, you gain its magical properties as described by the item. If the installed item grants a spell that you couldn't otherwise cast, you can cast that spell

Your chassis contains five Arcane Hardpoints capable of integrating magical devices.

During a Short Rest, you can install and remove a spell scroll, magic item, or wondrous item into an empty Hardpoint.

A spell scroll of 6th level or higher cannot be installed into a Hardpoint. Additionally, artifacts and legendary magic items can never be installed unless your DM allows it.

While an item is installed, you gain its magical properties as described by the item. If the installed item grants a spell that you couldn't otherwise cast, you can cast that spell thrice per Long Rest. If the item normally has charges, uses, or other limitations, those limitations still apply.

During your adventures, you may discover or craft Mechanicus Upgrades. These upgrades require specific materials, magical components, or relics determined by your DM.

Installing or removing an upgrade requires a Long Rest and appropriate tools unless an upgrade states otherwise.

Unless otherwise noted, each upgrade can only be installed once, and you can only maintain a limited number of upgrades at a time, determined by your proficiency bonus.

• You have disadvantage on Dexterity (Stealth) checks.
• You cannot benefit from Half Cover granted by creatures smaller than you.
• You cannot benefit from being Heavily Obscured by creatures or objects that would only conceal a Medium creature.
• Creatures have advantage on Wisdom (Perception) checks made to spot you.