In my my universe, there is a race of mechanical beings that are powered by magic and who live on the moon. Desiring more living space, resources, and the benefits of a planet with an atmosphere, the mechanical beings have set their sights on the Earth-like planet that they are orbiting and they wish to conquer it.
They know that they can use moon magic to transport some sort of craft to the nearby Earth-like planet, but they have discovered that their moon magic (distinct from the force that keeps them alive) fails at about the halfway point between the planet and the moon, so they can't use magic to assist their landing.
Their tests have shown that although their bodies are tougher than humans (they don't need to breathe, drink, or eat, are physically tougher and much more temperature-resistant), an individual cannot survive a drop to the surface of the planet without suffering at least critical injury if not total deactivation. They have come to the conclusion that they need some sort of landing craft to assist the individual units' survivability and also carry weapons and resources down to the target planet.
The mechanical beings don't have access to wood, silk, or any other products that might be made by plants or animals. This includes petroleum products. They are the only things that live on their moon, which has virtually no atmosphere. They have access to iron and can make steel, though carbon is difficult for them to find, so steel is quite precious. They can use moon magic to create heat and launch things off the surface of their moon, but not much else. They have access to most other metals, which are available with varying degrees of rarity. The mechanical beings have a superior grasp of mechanical engineering compared to the humans down on the planet, who all have medieval-level technology. The moon beings are also innately able to achieve great precision in their work. Their technology is roughly Renaissance-level, if humans in the Renaissance could work with incredible precision. They are unable to harness the power of electricity and have no computers.
Conforming to the restrictions above, how might the mechanical moon beings create a craft that can enable them to survive landing on the Earth-like planet? Good answers will provide a description of a craft and an explanation for how its design will prevent it from slamming into the planet or burning up, rendering the units and equipment that it contains totally useless. The best answers will describe craft that are as cheap and quick to make as possible.