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There's nothing inherently wrong with this at all - the important thing is that the introduction seem organic. Is there a reason why the existence of vampiric creatures wouldn't have come up (or ev...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/46396 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/46396 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There's nothing inherently wrong with this at all - the important thing is that the introduction seem organic. Is there a reason why the existence of vampiric creatures wouldn't have come up (or even been known) to the existing POV characters before this point? If so, and it's in keeping with your world (you wouldn't just introduce actual magical wizards into Season 3 of ST:TNG for example!) then go for it! Many stories with fantasy elements do similar, some by use of an audience surrogate (Harry in _Harry Potter_, Diana in the _All Souls_ trilogy, etc) others because a complex supernatural world is big - and it can take time for even seasoned initiates to encounter _everything_ (e.g. Harry in _The Dresden Files_). Without wanting to cross much into world building here vampires are a an easy soft ball for this sort of thing - common tropes revolve around them living somewhat secretly from the rest of society (_World of Darkness_, _Buffy_, etc) and being relatively well equipped to do so.