Augments
Over your long service to the cult you have steadily augmented your body. Choose your MAJOR upgrades. Assume that minor augments are like attaching a mechadendrite and have been done so over time. You have FIVE POINTS.

Rite of Pure Thought: The Tech-Priest has had a large portion of his organic brain replaced with a cogitator-like device, purging emotion and irrationality and enhancing their intellect. (1 pt.) Plus 10 to INT.

Clone Dynasty: The Tech-Priest maintains a legacy of specially grown clones. When a body fails, the priest's brain or consciousness is transferred into a fresh clone. (1 pt.) Prevents a game over if there is a successful transmission of memories upon the moment of death.
Scholaris Polypus: The Tech-Priest bristles with dozens of varied mechadendrites, above and beyond even what is usual for one of their kind. (1 pt.)

The Rite of Potentia Magna: The Tech-Priest has been turned into something akin to a living potentia coil, harnessing vast internal electrical energies which can be leveraged to power devices, or simply smite anyone foolish enough to get in the way. (3 pts.)
Personal Teleportation Unit: The Tech-Priest is host to an emergency teleportation unit capable of short localised 'hops' through the warp. (2 pts.)

Maglev Ascension: Such is the Tech-Priest's mastery over the power of magnetic repulsion that they are capable of limited flight. Metal objects dance at their whim. (3 pts.)

Gigas Mechanica: The Tech-Priest has augmented their body to be particularly large, making them giants even when compared to Ogryn and Astartes. (2 pts.) Plus 10 to toughness and  plus 5 to strength and agility.

In Utero Mechanica: The Tech-Priest has a particularly robust life support system. When completely sealed, this system allows indefinite operation in hostile environments ranging from hard vacuum to molten lava. (3 pts.)

The Rite of Corpora Multiplex: The Tech-Priest has several mechanical or cloned bodies under parallel control. The priest's consciousness resides in one body and controls the others through wireless transmissions, allowing them to potentially be in several places at once. (5 pts.)

Omniception: The Tech-Priest has an advanced suite of esoteric artificial senses allowing them to perceive one or more variety of information well outside the human norm, including but not limited to psychic fields, data transmissions, unusual radiations, etc. (1 pt.)

Corpus Gloriosa: The Tech-Priest's body is a thing of aesthetic perfection, whether constructed with the devotion of a renowned artisan or gene-sculpted into a vision of corporeal perfection. Very useful for dealing with those outside the Cult Mechanicus, who set more store in appearances. (1 pt.)

Integral Forcefield: The Tech-Priest has an internal forcefield to protect them from attempts on their life. (2 pts.)

Bezerker Implant: Tech-Priest is host to a Bezerker device which, upon activation, gives over control of their body to a machine spirit programmed only for destruction and mayhem. (1 pt.)

Brainwave Decoder: A particularly rare and temperamental device, this marvel of ancient technology allows the Tech-Priest to non-psychical read the minds of others by remotely decoding brainwaves. Its effectiveness is proven, if extremely erratic and taxing to the user's sanity. (3 pts.) You know how to read surface thoughts with a range of a regular room with regular people without penalty under normal circumstances. Other scenarios require rolls. Suffice to say reading your fellow cult members is taboo without sufficient justification.