From Lexicanum

The Collegia Titanica is the section of the Adeptus Mechanicus that includes the Imperial Titans, the colossal god-machines.

During the Horus Heresy, part of the Collegia turned against the Imperium along with almost half of the Adeptus Mechanicus. Out of all the Collegia's Titan Legions, only those on Terra remained loyal. The rest declared for Horus.

The Collegia is divided into divisions, such as Divisio Mandati, Divisio Telepathica and Divisio Investigatus. Most important is the Ordo Militaris which actually includes the Battle Titans, and is itself further divided into "Legions" or "Orders": groupings of Titans such as the Fire Wasps legion or War Griffons legion. Each Legion is headed by a Grandmaster.

Each Titan is manned by a crew consisting of a single Princeps in command, assisted by Moderati, Tactical Officer, Chief Engineer, an engineering crew, and Servitors. The number of each is dependent on the type of Titan.

A Princeps commands his Titan through the MIU link to the Titan's "spirit," controlling the Titan's movements through his thoughts. The Titan becomes an extension of him; when damaged, he feels pain, when victorious, he feels elation. This link grows so strong that his mental health will slowly deteriorate when unlinked. Because of the immense power of a Titan's spirit, the Princeps must also possess the strongest of wills to survive such a link. He can assume direct control of any system, though it is usually aiming and fire control that is taken. Regardless, Titans must have both Princeps and crew to function. The Princeps' relation to the Titan is similar to that of a Space Marine within a Dreadnought, however Titans eventually form their own minds from centuries of experience. The link in some cases gets so strong that the Princeps becomes physically-integrated into the Titan, and cannot be removed until he dies.

Related Articles

• List of Titan Legions

Sources

• Adeptus Titanicus (Game)
• Warhammer 40,000 4th Edition Rulebook, The Adeptus Mechanicus
• Titan (Graphic Novel Series) Abnett, Dan; Williams, Anthony and Lanning, Andy (2004). Nottingham: Black Library. ISBN 1-84416-123-4.