[@Cyclone]
Here is where I defined conjuration, just a few paragraphs later:

[quote=The section on Schools of Magic]
As for conjuration: when one has worshiped demons from other realms for many long years, they might find themselves gifted with forbidden knowledge. Conjuration is not the only secret they may learn from the Masters of Evil, but it is the most notable: it allows the summoning of demonic servants. As one learns, they will go from calling upon simple imps and hell-bats, to bring about the chaos of hulking battle creatures and world-destroying monstrosities. The best part is...the fiends are unable to break themselves away from the Occultist's grasp.

[/quote]