From Warhammer 40k - Lexicanum
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A '''Prognosticar''' is a title and position amongst the ranks of the [[Grey Knights]] [[Chapter]] that consists of powerful specialised [[Psyker]]s. As they are sensitive to the fluctuations to the [[Warp]] which allows them to detect the psychic tremors that are inherent in [[daemon]]ic incursions into realspace. Thus, a Prognosticar is capable of determining the location and severity of such an event. This skill appears similar in manner to an oracle in form though in function is similar to a highly specialised form of hunting instinct. Within the Chapter Augurium, Prognosticars conduct their rituals and meditations in the light of candles where their divinations forewarn the Grey Knights in their deployments.
This allows the Grey Knights to send their warriors based on the nature of the threat at hand rather than delayed or fauly battlefield intelligence reports. Whilst there is an element of inaccuracy, without the service of the Prognosticars - the duty of the Grey Knights would be impossible to accomplish. Thus, Grey Knight commanders often do their duties out of pragmatism rather than due to callous disregard of life as they are well aware of the dangers of a daemon due to the divination of the Prognosticars.
<sup>1 </sup>:[[Codex: Grey Knights (5th Edition)]]
[[Category:Titles and Ranks]]