Forbidden Knowledge is knowledge that is derived by means of manipulating powers of The Void. It is anathema and dangerous. There are multiple levels of forbidden lore: Lovigdril (twisted by The Void) and Lovignhal (understood through The Void). The former has many formal practitioners – it is used as a shortcut in the path to understanding and knowledge by those with (typically) lesser affinity and aptitude. The later assumes that the seeker possesses not even rudimentary foundations to understand the knowledge (such as a magus seeking spells), but passes the consciousness of the seeker through the Void to impart such faculties. It is through this means that powerful magical abilities are made available to those who seek them – usually at the price of madness. Sanity is drawn on in the place of other energies to fuel such powers. More often than not, it is powerful artifacts (tomes, machines, constructs. etc.) built by entities of The Void seeking to siphon essence from the Aether.
Only the most desperate seekers of power plumb these depths. The lure of great power outside the constraints of affinity and aptitude is often too much for those who travel down the path, leading most often to madness and suicide. Powers normally beyond the ken of creatures can be made available. This knowledge is usually presented in a means which entails both ceremony and ritual, due to the alien thought processes required.