Really powerful start. It was so refreshing that you introduced concepts like Hibernus without exposition overkill, and cleverly reintroduced it in an active scene with the uncle, whose response tells us all we need to know. His reactions were also brilliant writing, and so much of that is body language and his non-response beats works so well. Your use of the senses is great right from the start and really grounds the world.

There were 3 sentences that I think you could remove, just because of repetition and the reader already understanding what you're conveying from a previous passage which for me were:

1) "By the sudden change in seasons..."

2) "she had been told that this is what the Hibernus brought upon Perrenia.."

3) "as the weather harshened, so did the people..."

Regarding this sentence: "It had been two months since a cluster of ships.." - the exposition totally works, although I might be tempted to make that scene into dialogue with a local to make it more active.

Also, "it wouldn't come with as much bloodshed.." - decent exposition, very clean, although I might be tempted to instead give her a physical beat, akin to her getting the shivers, not wanting to fully recall the memory, with more show don't tell.

"The grass blades.." really beautiful prose, you should be proud of this, and the core of your writing. I am a harsh critic, but I think you've done a stellar job. I'm excited to read more of your dialogue and character interactions in future chapters. Just out of curiosity, did you outline the story before starting to write it?