It could be related to using healing magic on the wrong targets. In the nack novel, perhaps there are rules about who can be healed and if these are violated, it's the wrong way. Say, using it on an enemy who has dark magic that corrupts the healing magic.
It wasn't a doujin novel, and there was no mention of the two characters, Krasus and Brocks. Are there any other web novels that you need to recommend? I can recommend some novels that suit your preferences~
One example could be using healing magic without proper diagnosis. In the nack novel, if a healer just starts using magic on a patient without knowing what's really wrong, it might make things worse. For instance, if there is a magical curse causing an illness and the healer just tries to heal the physical symptoms.
Well, in this fanfic, Naruto could be presented as an ancient in terms of his longevity or having been in a deep sleep for ages and waking up with unique abilities and perspectives. It could also involve him uncovering ancient secrets and using them to shape the present.
In some fanfictions, Naruto can be reimagined as an ancient demon. Fanfiction allows for a lot of creative liberties, so authors might take the character of Naruto and give him this dark and otherworldly twist. It's all part of the fun of exploring different versions of the beloved Naruto character within the realm of fan - created stories.
Another idea is that an ancient vampire lord from a different dimension arrives in the Naruto world. He's extremely powerful and starts to turn some of the ninjas into his vampire minions. Naruto and his friends have to find a way to stop him. They might have to travel to the vampire's home dimension to find a weakness. This would involve a lot of exploration and discovery, both in terms of the new dimension and the vampire's powers.
Yes, there might be. The Naruto fandom is quite vast and creative, and it's not uncommon for fans to create unique crossovers or alternate versions of the characters. There could be a fanfic out there that imagines Naruto as an ancient vampire, with his ninja skills perhaps enhanced or changed in interesting ways because of his new vampiric nature.
He might meet an old hermit who has been guarding the temple for centuries. The hermit could have valuable knowledge about Naruto's parents or some secret ninja arts.
He might meet an ancient sage who has been sleeping in the ruins for centuries. This sage could have a vast amount of knowledge about chakra and the ninja arts that Naruto could learn from.