Psi-Titan

The Psi-Titan is amongst the most secret and terrible of all god-engines, a war-machine of the shadowy Ordo Sinister whose reactor is bound to the shackled, ruined mind of a powerful psyker. Through this abominable union the Titan channels the raw fury of the warp, projecting fields of unmaking that shred the immaterial defences of enemy engines and blast their crews' minds to ruin.

Few know of the Psi-Titans' existence, and fewer still could bear the truth of their making, for the process that creates one is a horror even by the standards of an age drowning in horrors. In the Heresy they were unleashed only against the most dangerous foes, striding onto the field to counter enemy sorcery and to break god-engines that no conventional firepower could touch. A Psi-Titan is a weapon that fights on two battlefields at once, the material and the immaterial, and it is merciless upon both.