[X] Let Magnus Uncover its secrets
[x] Danger Analyses of Planets
On an unrelated note, what would the legions warp tech dreadnoughts and titans be like?
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The Wardens of Ahat-iakby
Crafted in the image of Prospero's ancient gods, the Wardens of Ahat-iakby are a set of Warlord-sized Titans whose creation was commanded by Magnus the Red in the late days of the Great Crusade, when the technological mastery of the Mechanicum was at its peak. The Wardens were created using a fragmentary STC recovered by the Thousand Sons on a world that had been scoured clean of life by violent solar eruptions. It took many tech-priests many years to extrapolate the missing parts of the schematic from the remaining data, as well as insights from the Crimson King himself and the dedicated help of his sons. However, their construction was halted by the eruption of the Roboutian Heresy and the need to focus resources on fighting the hordes of the Arch-Traitor.
The Thousand Sons reclaimed the pieces of the project on forge-worlds that had been devastated by Guilliman's armies, and the Wardens were finally completed during the Scouring. Their first battle was the siege of the Fang, on Fenris, where they fought against the Titans whose services the Sixth Legion had managed to retain. The Warhound packs of Legio Fulcrum were torn to shreds thanks to the Wardens' unique ability : their capacity to wield psychic power as a weapon on a Titanic scale. Using priceless archeotech, the Wardens can channel the energies of the Warp safely and unleash devastating attacks, capable of annihilating entire companies of warriors no matter how well armored they might be. With purifying fire and kinetic blasts, the Wardens hold power far greater than that of conventional Warlords – the tech-priests estimate each of them is worth five Warlords.
However, there is a price to pay for the use of the Wardens on the battlefield. The machine-spirits of the Titans are even more prideful than those of other God-Machines, each having taken on traits of the ancient god in whose image it was shaped. As such, no mortal mind, not even one trained by the Collegia Titanica, can hope to master them. The only way to awaken the machine-spirit of a Warden is for a son of Magnus – or a human psyker of equivalent power and discipline, which is incredibly rare even in the Prosperine Dominion – to sacrifice himself to serve as princeps. The Warden will drain the essence of the sacrifice, ultimately killing his body and reducing him into one more spiritual echo within the Titan's core. There can be no avoiding that fate once the connection has been made and the Titan has been roused from its slumber – any attempt at severing the connection will result in the immediate death of the princeps. Because of this, the Wardens are only awakened in the direst of situations, and spend the centuries – sometimes millennia – between their awakenings within the walls of Ahat-iakby. Only when war comes to the Prosperine Dominion in terrible scale were the Wardens roused. One such occasion had been during the War of the Beast, when the Wardens had fought against the Ork Gargants throughout the Dominion.
By the time of the Siege of Terathalion, the Wardens were legacies of a distant age that were still religiously maintained by a dedicated order of tech-priests that the rest of the Adeptus Mechanicus regarded as forever walking the line between orthodoxy and techno-heresy. There were rumors of other Psi-Titans in existence, used during the Great Crusade only at the Emperor's own command and against the most terrible of enemies, but those hadn't been seen in ten thousand years, and should they exist the Inquisition would doubtlessly keep any trace of them under utmost secrecy."
-Zahariel, The Roboutian Heresy, Siege of Terathlion Part 2