In the vast and imaginative world of Hunter X Hunter, one concept that consistently captures fans' minds is Nen. This technique enables individuals to use and manipulate their life energy, known as Aura. Far from being a uniform concept, Nen is a multifaceted system that could be wielded in many ways depending on the user. From enhancing physical strength to allowing communication across vast distances, how a person uses Nen is as diverse as it is intriguing.
Source：https://www.cbr.com/hunter-x-hunter-nen-technique-explained/
