Due to your creators seeing no need in you to make any sounds, you are unable to make any sounds aside from ones through interacting with the enviroment. This also means you cannot use any spells with a verbal component.

While sitting you are only 1ft tall, when standing you are a little over this. Anything worn will be considered as part of your height if applicable.
You gain +1 to your Charisma stat and gods are more likely to give you visions or messages.

Due to your head being much bigger than your body you have an internal gyroscope to keep you upright. This also means that you have a hard time peaking around corners or lean.
If this gyrosope is damaged or afflicted by something you are unable to stand up straight and your head will constantly be dragging against the ground. However, you will be able to lean and peak around corners.

You have been heavily modified and placed inside a chest heavily fortified and an enhantment similar to the bag of holding.
You have a natural AC of 18. The weight of whats in your chest is always 0lb and can store anything reguardless of size.

Due to your construction you move very slowly (10ft), cannot swim and have difficulty climbing.

As an action, you are able to retreat into your chest, increasing your AC by 2, however while in this form you are unable to perform any actions aside from ones on yourself and require an action to revert to normal.

Your eyes are specially equiped with nightvision and you are constantly glowing in select areas while charged. Giving you Darkvision (120ft), disadvantage to stealth checks and immediate fails to sight based stealth checks while in the dark.

Due to your technological modifications you require constant power to function. Your chest's surface has solar panels built in which charge your internal battery. A full battery lasts for around 12 hours without sunlight. With the solar panels while in the sunlight you can last around 36 hours before your battery is drained. While in chest form you consume much less power lasting 96 hours from a full battery and can charge up fully, taking 8 hours to fully charge.

When your battery is dangerously low you revert to chest form and require to be put on charge before 4 hours are up, which if unfulfilled you will die. When on death saves you loose half an hour of charge on a successful roll and 1 hour of charge on a failed roll. If you fail your death saves instead of immediately dying you are placed into the uncharged state and have only 1 hour instead of 4.

You are resistant to lightning damage and gain 1 cell of charge per point of damage.

Full battery = 12 Cells.
Uncharging = 1 Hour per cell of charge used.
Chest form = 8 Hours per cell of charge used.
Solar panels = +2 cells per 3 hours of charging.
Uncharged State = 1 minor Backup Cell (Half a regular cell)