The LOTR movies' Arwen takes traits from another female Tolkien character, Luthien, whose story was never adapted for the screen.

Tolkien's novels, Morgoth's crown did not survive ... As Beren and Lúthien fled, a giant werewolf named Carcharoth blocked their escape from Angband. Carcharoth bit off Beren's hand, including ...

Beren’s hand was torn off and eaten by Carcharoth, the most deadly of the wolves, and Beren later died of his wounds they were so bad. This is certainly one element of Tolkien’s stories that ...