The Divine Hearalds is the remnants of a detachment of Titans that followed the 10th during the Great Crusade. All that remain to them is one Warlord titan, two Reavers and four Warhounds. They travel the galaxy in a single Titan Tender, which contains sufficient titan lander capacity to put down the entire titan detachment in one go. there is also a 2.000-strong skitarii regiment, plus all the other odds and ends you need to make Chaos titans tick.

The Divine Heralds hold that the Emperor was NOT the Omnissiah - the Messiah of the Machine God. That's not very original; the majority of the Dark Mechanicum agrees with that.  Where they diverge from 'mainstream' Mechanicum dogma is that they hold the Emperor to have been a Prophet of the Machine God, but that he became corrupted by human emotions and ambitions and therefore fell into apostasy. Most of the brethren and the Word Bearers they used to work with in the past consider this and odd notion (at best).

Their Warloard titan has been dormant for ages. According to their beliefs it will only come alive when the Omnissiah walsk the galaxy. He will call out to the god-machine and it will wake and lead the Hearlads to their Messiha. The Warlord is called the Divine Herald - for it is who who will proclaim the Omnissiah.