A/N: This is the first of 100 stories, which will almost certainly encompass my largest fanfiction collection by the time it's done. Each story will be inspired by a different word from a foreign language, and those words will be included at the top of each chapter for your convenience. Thank you for reading, and as always, the Potterverse belongs to JK Rowling.
trygghet - (n.) safety and security, with a calm, cozy, peaceful feeling from all uncomfortable or unpleasant things in one's job, home and family [Swedish]
If one was asked to describe Luna Lovegood, eventually the word "serene" would pop up. Most attributed the lithe blonde's sometimes spacey nature to the manner in which she grew up, and didn't press very much into understanding why she acted that way. Growing up in the house she had with the family that she did had heavily influenced Luna's mannerisms, but not in the way most would have expected. In fact, it was largely due to her mother that Luna became who she was.
When Luna was 5, her mother began helping her develop rudimentary Occlumency shields. The training wasn't particularly complex, just her mother asking young Luna to "imagine a happy, peaceful place, and explore it in your mind." Once Luna could consistently visualize the place in her mind, she started funneling small bits of magic into specific bits of it, namely a unicorn guardian that she called Charlie. By her ninth birthday, Luna was able to keep out a focused probe from her father entirely, much to the delight of both her parents.
Sadly, the family's joy would be short-lived, as Pandora had her spell crafting accident mere weeks later, and Xeno wasn't nearly as knowledgeable in the defensive mind arts as his wife had been, so Luna was forced to develop her mind alone from then on. And as future Legilimens who would find the need to test Luna would discover, just because she didn't know the proper methods to advance her shields did not mean that they did not advance. They just advanced in a way that most experts in the field would politely term "stranger than normal."
Some of the more nonsensical improvements that were catalogued during the one and only visit the experts were allowed into Luna's head included a purple and yellow striped cat that seemed to almost entirely vanish at will, another cat that flew across the sky trailing rainbows behind it, a door standing by itself in the middle of a forest that didn't open unless you shouted a passphrase at it (and none of the experts could understand why the passphrase was "FOR NARNIA!"), and the addition of a second guardian animal. The latter was discovered while Luna, who had been traveling with the experts astride Charlie, suddenly turned and looked towards what passed for the horizon in her mind. There, racing towards the group with a rider of its own aboard, was a horse with flaming hooves and a fiery mane. In no time at all, the horse and its pale rider arrived to stand near Luna and the experts. Luna smiled, but also showed some puzzlement. When asked why, she answered, "Well, I recognize this noble steed, but I cannot say that I've ever met anyone that resembles the rider. Who are you, miss?"
The young woman spoke a few words in a language that sounded like gibberish to all assembled besides Luna, before saying in English, "My name is Serenity. Do not fear, I am here by invitation." The experts noted the slight similarities between the new girl and Luna, and chalked it up to Serenity being some lingering memory of Pandora Lovegood who had taken up residence in Luna's mind. They would complete their study soon after without much trouble.
Some academic papers were published about Luna's unique mindscape, but few understood how much it all meant to her. For Luna Lovegood, Serenity was her everything. Serenity helped keep her as grounded as she would ever be. She said so publicly, and while her statement was met by a few snickers, it was generally accepted at face value. Though the speculation that Serenity was her mother did give Luna some pause, she and only she knew the truth. For the "gibberish" language that the experts had reported hearing was not gibberish at all, but rather the language of her mother's ancestry, a language Luna had grown quite familiar with after many recent visits to Sweden to learn more about her own heritage. This fact was well known, but none had bothered to go beyond the obvious potential connection. Wizards were rather lazy when it came right down to it, and Luna didn't bother to correct their misconception.
After all, if they didn't know that back in Sweden, a very popular masseuse named Serenity worked at a parlor called "The Crumple-Horned Snorkack" and just so happened to have a thin gold band on her ring finger that matched the one on Luna's, what was the point of spoiling her fun in telling them?