[quote=thewizardguy]
Actually, in the Christian apocalypse he is one of the Four Horsemen. The Devil is locked in Hell by four seals. As each seal is unlocked, one of the Four Horsemen rides out. The first is conquest, the second is famine, the third is war, the fourth is Death. Death comes last.
[/quote]
However, death is also around before the apocalypse, so that would make total sense. However, Unicron doesn't know of Christianity, so he has another reason.
(thanks for clarifying that for me)