I'm not sure specifically as I haven't read this particular fanfiction. But generally, it might involve Ash using his aura to communicate with the tree, perhaps to gain some sort of power or knowledge from it.
I'm not entirely sure specifically what 'ash uses aura fanfiction' is about without more context. It could be a fan - made story where the character Ash makes use of aura in some way that's different from the original source material.
Sorry, I don't have any specific 'ash uses aura fanfiction' to recommend. You could try searching on fanfiction websites like FanFiction.net or Archive of Our Own.
One idea could be that the ash aura tree is a magical entity in a fantasy world. It could be the source of power for a group of heroes. They have to protect it from dark forces who want to use its power for evil. Another idea is that the tree has a sentient spirit within it that can communicate with a chosen individual, guiding them on a journey of self - discovery.
In this fanfiction, Ash's aura could be like an invisible shield around Dawn. His strong connection with his aura allows him to project it towards her. If there are any attacks, whether physical or from special abilities, the aura could absorb or deflect them. It's as if the aura becomes a safeguard that he can manipulate to keep Dawn safe.
First, you should define the role of the ash aura tree. Decide if it's a good or bad entity. For example, if it's good, you can start with a description of its beauty and the positive influence it has on the surrounding area. Then, create a main character who has a connection to the tree, like a guardian or a seeker of its power.
One great aspect of Aura Guardian Ash fanfiction could be the exploration of Ash's latent aura powers. Maybe in these stories, Ash discovers he has a much deeper connection to the aura realm than he ever knew. This could lead to him having new abilities and forming unique bonds with Pokémon that are also attuned to the aura.
One scenario could be that Serena is trapped in a collapsing cave. Ash uses his aura to sense the safest path to reach her and then uses aura - enhanced strength to move the large rocks blocking her way. Another is when Serena is poisoned. Ash's aura could be used to purify the poison in her system, similar to how some Pokémon can use their powers to heal. He focuses his aura on her body, and the positive energy slowly drives out the toxins.
It could be that there is a young, impressionable character who looked up to Ash Aura. After the betrayal, this character is confused and starts to question his own beliefs. There might also be a powerful mage in the story who has the ability to see the truth behind Ash Aura's actions and is trying to prevent the chaos that the betrayal has caused.