Heresy

Heresy or Heretical Lore are forms of theology and ritual which are banned, either because they threaten the establishment or because they are physically dangerous (usually, they are a bit of both). Heretical Lore is most common to the Order of Heretics, although there are plenty of others who would accumulate this Lore. Scribes, who collect any Lore for the sake of knowledge, will also have surpassing knowledge of Heresy. 
Obviously, members of the Order of Heretics will start out with some knowledge of Heretical Lore. They should also be allowed to acquire it more quickly than others. 
Heresy is very similar to Forbidden Knowledge, and there is much overlapping between the two. But remember that Forbidden Knowledge tends to deal with raw information, Heresy also involves the rituals, people groups and experience in interacting with these people and performing said rituals. Heretical Lore is more specific than Forbidden Knowledge and represents personal practice. 
*Note: If a character uses Heretical Lore often, especially near other Adepts, it should be kept in mind that most Adepts won't react well to it. Heretical Lore tends to involves dark, strange and often harmful things. Squadmates who discover one of their own practicing Heresy probably won't be very happy about it. In some circumstances, it could drive a wedge between the practitioner and their Adept community.
Category:Infernal