Created by magos of the Dark Mechanicus, Death bots are fusions of technology, robotics, and warp craft. The mechanical body is used to house the animus or spirit of a warp entity. Death Bots are not as powerful as the corrupted Kastellean robots but are frequently employed in sentry duty of important sites. Conversely they are also frequently employed in flashfire attacks where they drop to the planets surface and simply kill and destroy as much as possible before they are destroyed.
This model is from the Warmachine line. I have added parts of a havoc launcher, a tentacle from the maulerfiend kit, and a few spikes.