Arkhan Land was one of the most famous members of the Adeptus Mechanicus, a Magos and technoarchaeologist, one who went recovering ancient texts of technology. He was responsible for the recovery of several STC fragments from the Great Librarius Omnis under Mars, and their restoration, notably leading to the recovery of the blueprints for the Land Raider battle tank, the Land Speeder fast attack vehicle, the Land Crawler agricultural vehicle, all of which are named for him. It is said he died on Mars while on his second expedition into the Librarius Omnis looking for more technology. Two centuries after his expedition was declared lost, his vox diary was found. It spoke of how his team had been picked off one by one by an unknown entity. There is some debate as to the nature of this entity. Some say it was a sentient virus, others favour a mutant or psychic entity that may have lain dormant in the ancient areas of the Librarius until his meddling awoke it. Some even go far as to say that this mysterious entity was the C'Tan The Void Dragon.
Sources
UK White Dwarf 245, pg 21, by Gav Thorpe
