Directed by: Anna Foerster
Starring: Kate Beckinsale, Charles Dance, Theo James, Tobias Menzies
Selene: I have lived for a thousand years, and I may live a thousand more, or I may die tomorrow. But I no longer fear death, for I have known it once already.
Selene: There is no beginning, there is no end. There is only becoming.
Semira: Don't think, Varga. You'll hurt yourself.
Plot hole: This movie introduces, rather casually, nightshade as a vampire vulnerability. It works practically as in the videogame Skyrim, so whoever wrote it in the script most definitely played it. The problem of course is that a toxin that can murder most vampires and indefinitely paralyze the strongest elders, is a world-breaking concept that would have ended the war hundreds of years earlier, and instead is never used before or since the small scene it's instrumental to. Foreign translations which identify the nightshade with the more specific Belladonna plant (one of the most commonly used herbs since the ancient times) further aggravate the problem.
Trivia: "Blood Wars" has been confirmed to be the final "Underworld" to star Kate Beckinsale, and possibly the final film in the series. It was originally intended for there to be one final entry in the series featuring Beckinsale's trademark character Selene to finish off her storyline, but Beckinsale stated in late 2018 that she felt she had done "enough" films in the series and wasn't interested in reprising her role for a sixth film. After the film under-performed at the box office, there has also been no news on any future films, with series co-creator Len Wiseman instead expressing interest in rebooting the franchise as a television series.
Answer: Amelia was a Vampire Elder. She had responsibilities to the coven, to be gone for days or weeks would be normal, but months. Viktor had a suspicious nature. After discovering his daughter's affair with Lucian and the rebellion of the Lycans, he probably feared another betrayal.