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.

Underworld: Blood Wars (2017)
1 plot hole
Directed by: Anna Foerster
Starring: Kate Beckinsale, Charles Dance, Theo James, Tobias Menzies

Continuity mistake: Selene normally wears high heel boots. They briefly turn into flats during her caged fight with Varga, right before he betrays her. (00:26:40)
Semira: Don't think, Varga. You'll hurt yourself.
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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.