I'm not entirely sure as it's not a very common or well - known specific concept. It could potentially be a fan - made story where Naruto has some sort of connection or admiration for the Phenex, perhaps in a crossover or alternate universe scenario.
Well, if Naruto had the Phenex power and could use Amaterasu in the Susanoo, it would be an insanely powerful combination. The Phenex power might enhance the already intense Amaterasu flames within the Susanoo. Naruto's chakra control would play a huge role in how he wields this newfound power. He could potentially use it to create massive destruction or for defensive purposes, like creating a shield of super - hot Amaterasu - laced Susanoo around himself or his allies.
One possible fanfiction could be about a character with the powers of Phenex in the Naruto universe. They might use their unique abilities in combination with Naruto's own powers, like the Rasengan. When it comes to Amaterasu and Susanoo, perhaps this new character has to face off against an enemy who wields these powerful Uchiha abilities. The story could explore how the Phenex powers interact with the chakra - based abilities in Naruto's world, whether they enhance or conflict with each other.
Then there could be a Phenex clan member as a main character, perhaps a young Phenex who is on a journey and crosses paths with Naruto. This Phenex character could have unique abilities like fire manipulation and regeneration, which are typical of the Phenex in some fanon interpretations. They could befriend Naruto or start off as rivals.
Since I haven't read this particular fanfiction, it's hard to say exactly. However, based on the title, it seems that it could be a story where the concept of the Phenex, which might be some kind of powerful or special entity in the fanfiction, has a forgotten hierarchy in the Naruto universe. This forgotten hier might be rediscovered by a character, perhaps Naruto himself or someone close to him. It could lead to all sorts of adventures, power struggles, and revelations as the character delves deeper into the secrets of the Phenex hier.
I really liked 'The Phenex Legacy in Naruto'. In this fanfiction, the concept of Azure Phenex is blended with the ninja world's lore. It shows how the power of Azure Phenex can change the power dynamics in battles. The story also delves into the backstory of the character related to Azure Phenex, which makes it more engaging.
Maybe in the fanfiction, Naruto is reincarnated as Riser Phenex in the Naruto world. He has to deal with the memories and instincts of Riser while also trying to maintain his identity as Naruto. He could use Riser's abilities, like his fire - based powers and his unique magic, to fight against new threats in the Naruto universe and also to protect his friends and village.
One common theme is power - up. Since Naruto is already a powerful character in his own right, and the DxD world has its own power system, often in these fanfictions Naruto gets new powers or finds ways to combine his existing powers with DxD elements. For example, his chakra could be combined with the magic in DxD.
One interesting 'Naruto Phenex DxD Fanfiction' could be 'Naruto in the DxD World'. It combines the elements of Naruto's skills and the unique world of DxD quite well. The story often has Naruto using his ninja abilities in the DxD universe, which makes for some exciting battles and interactions with the DxD characters.
Well, start with the big fanfiction platforms. FanFiction.net is a great place to look. They have a large collection of Naruto - related fanfictions. Archive of Our Own (AO3) is also a good option. They are known for their wide variety of fan - created works. Another place could be Wattpad, although it might be a bit more hit - or - miss. Search carefully on these platforms using the exact title 'naruto is a phenex fanfiction' to increase your chances of finding it.