With his aid she came to Sauron's fortress where Huan defeated the werewolves of the Enemy, Draugluin the sire of werewolves, and Sauron himself in wolf-form. Then Lúthien forced Sauron to give ownership of the tower to her. She freed the prisoners, among them Beren. Meanwhile, Sauron took the form of a vampire and fled to North.
Beren wanted to try his task once more alone, but Lúthien insisted on coming with him. However they were attacked by Celegorm and Curufin, who had been exiled from Nargothrond. Beren was wounded by Curufin, but Lúthien healed him. Through magic they took the shapes of the bat Thuringwethil and the wolf Draugluin that Huan had killed. Thereby they were able to enter the enemy's land and at last came to Angband and before Morgoth's throne. There Lúthien sang a magical song which made the Dark Lord and his court fall asleep; then Beren cut a Silmaril from Morgoth's crown. As he tried to cut out the others, his knife broke and a shard glanced off Morgoth's face, awakening him. As they attempted to leave, the gate was barred by Carcharoth, a giant werewolf, who was bred as an opponent to Huan. He bit off and swallowed Beren's hand, in which Beren was holding the Silmaril. Carcharoth was burned by the pure light of the Silmaril and ran off madly. Eagles then helped Beren and Lúthien escape.
Beren and Lúthien returned to Doriath, where they told of their deeds and thereby softened Thingol's heart. He accepted the marriage of his daughter and the mortal Man, although Beren's task had not been fulfilled. Beren and Huan participated in the hunt for Carcharoth, who in his madness had come into Doriath and caused much destruction there. Both of them were killed by the wolf, but Carcharoth was also slain. Before he died, Beren handed the Silmaril, which was recovered from Carcharoth's belly, to Thingol.Grieving for Beren, Lúthien also died, and came to the halls of Mandos. There she sang of her ill fate, that she would never again see Beren, who as a mortal Man had passed out of the world. Thereby Mandos was moved to pity. He restored Beren and Lúthien to life and granted mortality to the Elf.They settled in Ossiriand and died there.