At this moment, we all dodged to the side and stared in shock at the huge indentation smashed into the wall beside us.
Based on what I currently knew about ghosts, they had three ways to increase their strength.
The first was through Feng Shui and geographical environments, absorbing resentment and baleful energy, or possessing enough resentment themselves.
They relied on their obsessions to continuously transform into baleful spirits and eventually advance further.
The color of their clothes and eyes would gradually change as well, until they became incomparably vicious ghosts.
This type of ghost was also the most common. The vast majority of vicious ghosts and evil spirits became ferocious through this method.
The second was ghost cultivation. Before or after death, these ghosts had mastered cultivation methods and knew how to absorb vital essence and moonlight to enhance their abilities.
Xiao Yu was currently in such a state.
Even though she had a physical corpse, she was still a ghost herself—and an extremely powerful one.
The third was the enhancement of external objects, such as crystals.
Crystals were exceptionally compatible with spirit bodies. As long as a ghost possessed crystals containing different energies, it would gain tremendous power.
But the Phoenix-Pattern Jade Pendant on my chest had not reacted, so it was not a crystal.
That left only the first and second possibilities.
From the looks of it, they were not the first type either.
Ghosts that reached this level of power had already become yellow-robed.
Yellow-robed vicious ghosts generally lost their sanity, leaving only bloodlust, slaughter, and obsession.
Their appearances and eyes would change as well.
But these two had not changed, so they clearly were not that type either...
That meant these two ghosts could only be the second type: ghost cultivators.
They had mastered some