Titandeath was not only a great story, it was very instructive in furthering my knowledge about the Collegia Titanica. The Heresy is raging on and the Beta-Garmon system is the next victim of the conflict.
If the Loyalists can stop Horus' armies at Beta-Garmon, then they will not be able to move onto Terra. However, Horus is well aware of this and sounded the death knell for the system. This war for Beta-Garmon will not only have elements of the Traitor Astartes and Traitor Imperial Guard but it also involves the Dark Mechanicum and the Traitor Titan Legions.
A Titan, or God-Machine, is a massive combat walker that is worshipped by the Mechanicus. Depending on the size, it is piloted by a Princeps and crewed by several to a dozen other Moderati. From the Scout-Class Warhounds which tend to run 15 meters, to the Reaver- Class coming in at 25 meters, all the way up to the truly intimidating Warlord-Class which can run 33 meters or more- these machines are game changers on a battle field and this is proven in this story.
But I was very excited when they finally showed the true "God-Machines", the Imperator-Class Titans that are an awe inspiring 55 meters or more. Without too many spoilers, I found Sanguinius' logic about utilizing Beta-Garmon as the center-point for this Titan war, due to the catastrophic damage that would be caused by a similar conflict on Terra itself, to be quite logical.
Reading this will show why in the 40K timeline, 10K after these events, Titans are indeed rare. Also there is some interesting information about how the Mechanicum is now splitting into what will be the Loyalists calling themselves the Adeptus Mechanicus, the term by which they are known in the 40K timeline, and the Traitors becoming the Dark Mechanicum.
It is also important to remember that not all those who turned traitor did so due to the worship of the Chaos Gods, though that would come in time. In fact, the sheer ignorance of what is going on should be manifest in the actions of Terent Harrtek, Princeps Majoris of Legio Vulpa, when he unwittingly allows his sheer arrogance and lust for power to allow himself to undergo the profane ritual which will create the horrifying daemon-machine hybrid battle Titans used by Chaos in the 40K setting.
This story told from the viewpoint of the Legio Titanica Solaria (The Imperial Hunters), it is a great look at what it takes to become a Princeps for a Titan. A very interesting story and one that I not only enjoyed for the plot, but fo the additional lore about Titans. Any 40K fan will appreciate this story.