Aura

While everyone was getting shocked at the news of the upcoming war, Felix was busy reading the aura cultivation manual.

With the skill to learn any one language, he could now perfectly understand the language of the aura manual book and had spent 3 hours reading it.

In simpler terms, Aura is the energy that a living being manifests when they unlock the true potential of their body through meditation and training.

By following the meditation method mentioned in the manual, the nerves inside the body of the cultivator get stimulated and they start to greedily absorb the nutrients present in the blood, stomach, and atmosphere.

Getting a lot of nutrients absorbed will cause some deficiency in the body, that was why it was mentioned that the cultivator must cultivate diligently while maintaining a suitable diet. Whereas meditating in an area filled with magical energy didn't need the use of a diet.