It could be part of a prophecy related to the house. Say, in Ravenclaw, a prophecy might state that when a phoenix nests in the Ravenclaw tower, a great discovery or a new era of knowledge will begin for the house. So, the whole story could revolve around the students trying to understand and fulfill this prophecy.
One way could be as a guardian. For instance, if it's Hufflepuff, the phoenix could be seen protecting the Hufflepuff common room or helping the students find their way in the underground passages. It would be like a benevolent protector, guiding and watching over them.
The blurry vision could be a result of a dark magic spell cast by the Dark Phoenix or its followers. This would make it difficult for Harry Potter and his friends to fight back. They would have to find a counter - spell or use their non - visual senses to overcome the obstacle.
Well, in some Harry Potter fanfiction, Khajiit could be incorporated as new students at Hogwarts. Maybe they have their own unique magical abilities related to their Khajiit nature, like enhanced stealth or senses that could be used in magical tasks such as sneaking around the Forbidden Forest.
Hagrid would be a likely helper. He has a great knowledge of magical creatures and would surely know a lot about phoenix eggs. He could give Harry advice on how to take care of it.
Another way elements are used in fanfiction is through the creation of elemental spells. These could be ancient spells long forgotten in the official Harry Potter lore. A fanfiction writer might create a spell that combines earth and air elements to create a powerful gust of sand that can blind opponents in a duel.
In fanfiction, a phoenix in a Harry Potter house could symbolize rebirth and renewal for the house. It might represent the ability of the house members to rise from difficulties, just as the phoenix rises from its ashes. For example, if it's in Gryffindor, it could enhance the already present courage with an added aspect of being able to come back stronger after facing challenges.
Celtic mythology can be incorporated in various ways in Harry Potter fanfiction. Some authors might use Celtic deities or their powers as inspiration for new spells or magical artifacts. For instance, if there's a Celtic god associated with fire, a fanfic writer could create a spell based on that god's power. Also, the concept of Celtic otherworlds could be used to create new hidden realms within the Harry Potter universe, where different rules of magic apply. This not only enriches the fanfiction but also gives a fresh perspective to the existing Harry Potter lore by mixing it with the ancient and rich Celtic mythology.
In some fanfictions, 'azalea' might be used as a symbolic element. For example, it could be a magical plant in the Harry Potter universe within the fanfic. Maybe it has special properties like being able to heal or protect. In the context of Supernatural, it could be related to a case they are investigating, perhaps a place where azaleas grow is haunted or has some sort of supernatural activity.
Well, one way Sky Arcobaleno could be used in Harry Potter fanfiction is by having a character from the Arcobaleno world somehow end up at Hogwarts. This character could bring with them the knowledge and abilities related to the Sky Arcobaleno. For example, they might teach the students a new form of magic that is based on the properties of the Arcobaleno. It could also create new storylines around the mystery of this new element and how it affects the balance of power in the wizarding world.
In some fanfiction, dragons in the Harry Potter and Hobbit universes might be combined in terms of their magical abilities. For example, a dragon in a crossover fanfic could have the intelligence of a Hobbit - dragon like Smaug but also be able to use magic like the dragons in Harry Potter. They could be used as powerful plot devices, perhaps guarding a powerful magical artifact that both wizards from Harry Potter and characters from The Hobbit are after.
Core threads are incorporated in various ways. Writers often use the existing framework of the Harry Potter world. For example, if the core thread is the power of love, they might show characters using love to overcome dark magic. They can also introduce new sub - plots that are related to the core thread. If the core thread is the struggle between different wizarding families, new characters from those families can be introduced to drive the story forward.