You have a magical boiler inside of you, accessible with a grating on the stomach, which only you or creatures you allow can open, with a bonus action. In order to fuel yourself, you can use burnable items or magic items. You can place an item inside of the boiler as an action. If you use burnable items, you have to every week consume at least 50 pounds of coal or wood, costing 50 gold if bought from a shop. Normal fuel cannot be used to give you more maximum fuel than for 2 weeks. Magic items can be used as a much stronger fuel source. a common magic item fuels you for 10 days, a uncommon one for 25, a rare for 3 months, a very rare for 1 year, and if you for some reason decide to consume a legendary magic item, it has enough magical power to fuel you for 10 years. Artefacts cannot be consumed. The boiler is bigger on the inside, being able to hold an item that is maximally 500 pounds, not exceeding a volume of 64 cubic feet, with the hatch being 5 inches long. Any item placed completely inside the boiler is consumed if it is a burnable item or a magic item that is not an artefact. If you are submerged in water, your boiler will rapidly lose heat. For each hour spent in water, you lose 1 day's worth of fuel. If you take Cold damage, you lose an hour's worth of fuel for each point of damage taken. Fire damage does not affect your boiler.

As you are made of metal, you have resistance to fire damage.

Since you are so intricately crafted, you cannot be repaired by the Mending spell or other similar effects, but you also have been made so complex that you have something very similar to a soul, making you able to be detected by spells that detect living creatures, healed by spells such as Cure Wounds, and revived by spells such as Resurrection.

Even though your "soul" can be brought back from the dead, it still has some limits. You cannot be turned into an Undead, Speak with Dead has no effect on you, and your soul cannot be taken away or transported away from your body, which also makes it so that the Reincarnate spell does not affect you, and any spells used to revive you have to use your body as an additional material component, unless your body is completely destroyed.

You consume liquids by pouring them onto any part of your skin, after which they will immediately be absorbed and consumed. This works with any liquid, including poison or acid.