J.K. Rowling's last few tweets may have been fairly light-hearted and dog-themed, but that doesn't mean she's left her troll-destroying ways completely behind her.

Oh no. Judging by her latest exchange, the Harry Potterauthor won't be backing down from the occasional Twitter dual in 2019.

It started on Tuesday, when Rowling tweeted a link to some writing advice she's recently posted on her website.

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The advice is spread across two posts, and -- if you're a budding writer, or someone fascinated by Rowling's own journey -- it's certainly worth a read.

After she'd shared it, Rowling responded to a couple of fans on Twitter.

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This being Twitter, though, not all the responses were positive. It wasn't long before a troll had popped up, calling Rowling's writing "shit" and describing her as "politically delusional".

Needless to say, Rowling expelliarmus'd them into oblivion.

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Ouch.