From Warhammer 40k - Lexicanum
The Ciricrux Anima is a Psi-Titan support system.
Through the use of the Ciricrux Anima, a Warlord-Sinister is able to project psychic phenomena on a truly gargantuan scale, although without any of the nuance available to a Sanctioned Psyker. The effects include waves of preternatural fear, psychokinetics, leaching of life in the immediate area and even the temporal reversion of damage to the Titan itself. But the most devastating use of the psychic potential of the Ciricrux Anima is the focusing of its power through a unique weapon system, the Sinistramanus Tenebrae.
- 1: The Horus Heresy Book Seven pg.137