What follows is the Malleus summation in Encyclopedia Britannica.
Malleus Maleficarm – detailed legal and theological document (c. 1486) regarded as the standard handbook on witchcraft, including its detection and its extirpation, until well into the 18th century. Its appearance did much to spur on and sustain some two centuries of witch-hunting hysteria in Europe. The Malleus was the work of two Dominicans: Johann Sprenger, dean of the University of Cologne in Germany, and Heinrich (Institoris) Kraemer, professor of theology at the University of Salzburg, Austria, and inquisitor in the Tirol region of Austria. In 1484 Pope Innocent VIII issued the bull Summis Desiderantes, in which he deplored the spread of witchcraft in Germany and authorized Sprenger and Kraemer to extirpate it.
The Malleus codified the folklore and beliefs of the Alpine peasants and was dedicated to the implementation of Exodus 22:18: “You shall not permit a sorceress to live.” The work is divided into three parts. In Part I the reality and depravity of witches is emphasized, and any disbelief in demonology is condemned as heresy. Because of the nature of the enemy, any witness, no matter what his credentials, may testify against an accused. Part II is a compendium of fabulous stories about the activities of witches – e.g. diabolic compacts, sexual relations with devils (incubi and succubi), transvection (night-riding), and metamorphosis. Part III is a discussion of the legal procedures to be followed in witch trials. Torture is sanctioned as a means of securing confessions. Lay and secular authorities are called upon to assist the inquisitors in the task of exterminating those whom Satan has enlisted in his cause.
The Malleus went through 28 editions between 1486 and 1600 and was accepted by Roman Catholics and Protestants alike as an authoritative source of information concerning satanism and as a guide to Christian defense.
Encyclopædia Britannica, 15th Edition
Micropædia, Volume 7, Page 740