But Grandier gained the enmity of cardinal Richelieu after a public verbal attack against him. Richelieu ordered a new trial, with a "special" envoy, Jean de Laubardemont, a relative of the Mother Superior of the convent of Loudun. Grandier was arrested again at Angers, and the possibility of appealing to the Parliament of Paris was denied to him. Interrogated for a second time, the nuns (including the Mother Superior, Jeanne des Anges) did not renew their accusations, but the sentence had been past before the second trial.
The judges (the clerics de Laubardemont, Lactance, Surin and Tranquille), after torturing the priest presented fake acts signed by Grandier and several demons as a "proof" that he had made a diabolical pact. One of the acts was written in Latin and signed by Grandier; other was almost illegible, had plenty of strange symbols, and was signed by several demons with their seals, and Satan himself clearly written "Satanas". It is unknown if Grandier wrote the acts under torment or if they were a falsification; more, it is unknown whether Grandier's signature was his or a fraudulent one too.
Richelieu consummated his vengeance. In 1634 Grandier was found guilty of diabolical pact and the practice of witchcraft, sentenced to death, tortured, and then burnt alive at the stake.