The name of this article wasn't revealed in the novel and instead was given by editors of the wiki as substitute for lack thereof.
The Machines were a race of living machines from the Machine World. They developed their own cultivation system, different from any other.
Entire race was destroyed during the Primordial Era together with their world.
Mortal Monarch is the last member of this race. However, his body was destroyed in the past and later reassembled by Dark Crow with significant modifications.
Machines look like a humanoid iron statues formed from the combination of many exquisite parts.
Links 1 Representative(s) of Machines