<P> The next day, Irene and Burke return to the abbey, but only Irene can enter as it is cloistered . She meets some of the other nuns and learns that they are praying constantly, swapping in shifts, to keep the entity at bay . Sister Oana reveals the abbey's history: it was built as a castle by a duke who was obsessed with the occult . The duke summoned the demonic entity through a rift in the catacombs but was killed by Christian knights, who sealed the rift with an artifact containing the blood of Jesus Christ . The bombings during the Second World War caused the rift to reopen, unleashing the entity . Burke identifies the entity as Valak and discovers the Abbess has been dead all along . </P> <P> Frenchie heads back to the abbey to help Irene and Burke . Irene is attacked by Valak and joins the nuns in desperate prayer to fend off the demon . When the group reunites, Irene discovers that none of the nuns she had seen and talked to were real and she had been praying alone, later realizing that Victoria had been the last nun in the abbey and had sacrificed herself to stop Valak from possessing her body and unleashing evil . </P> <P> Theorizing that Valak can only be stopped if they seal the rift with the blood of Christ contained in the reliquary, the trio retrieves the vial with the key Victoria had . Irene then informs Burke that God has called her to make her solemn vows as a nun and asks Burke to elevate her to the status of a professed nun, which he does in the abbey's chapel . </P> <P> After the trio unlocks the tunnel door, Irene is lured into a pentagram and possessed by Valak . Frenchie smears some of the blood of Christ on her face, casting out the demon . Burke is wounded by Daniel's ghost as Valak starts to drown Irene in a flooded chamber . Irene expels the blood of Christ in the demon's face, banishing it as the blood of Christ seals the rift . After Frenchie resuscitates Irene, he reveals his real name is Maurice . Unbeknownst to the others, Maurice has been partially possessed by Valak, as evidenced by an inverted cross on his neck . </P>

Who plays the bad nun in the nun