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. Magic can’t put you to sleep.

Your AC is at least 13 + your Dexterity modifier (maximum +2) while unarmored, as your chassis provides natural armor. You can use a shield and still benefit.

As a bonus action, you can transform between Robot Mode (humanoid) and Alternate Mode (choose one vehicle or object form when creating your character, subject to DM approval). Examples:

• Vehicle Mode (e.g., truck, car, jet): Your speed doubles (or gains fly/swim speed if appropriate, up to 60–90 ft.), but you can’t use weapons, cast spells with somatic/material components easily, or manipulate objects finely. You gain advantage on Dexterity (Stealth) checks to pass as a normal object/vehicle.
• Object/Beast Mode (e.g., tank, cassette, mechanical animal): Similar benefits with thematic adjustments.