Because some readers said they weren't very clear about the realms, I'll explain the currently known martial arts stages and demon and ghost levels in a single chapter here.
Martial Arts Stages:
Body Refining Realm, Blood Refining Realm, Breath Nurturing Realm, Meridian Connecting Realm, External Qi Realm, Vajra Realm, Gang Qi Realm, Returning to True Realm, Hundred Orifices Realm, Innate Realm, God Connecting Realm.
The God Connecting Realm was not the limit. I would supplement higher realms mentioned in the subsequent chapters here. Each major realm was further divided into four minor realms: early stage, middle stage, late stage, and great perfection.
Demon and Ghost Levels:
Strange Monster (lowest level, corresponding to the Human Clan's Body Refining Realm and Blood Refining Realm)
Panic Level (corresponding to the Human Clan's Breath Nurturing Realm to Meridian Connecting Realm)
Ghost Level (corresponding to the Human Clan's External Qi Realm to Vajra Realm)
Sinister Level (corresponding to the Human Clan's Gang Qi Realm to Returning to True Realm)
Disaster Level (corresponding to the Human Clan's Embryo Transformation Realm to Hundred Orifices Realm)
Nether Level (corresponding to the Human Clan's Innate Realm to God Connecting Realm)
Lastly, I'd like to address something. Some readers asked why the protagonist couldn't match others even with decades or centuries of cultivation.
This world's setting was such that each year of cultivation for the protagonist equaled what an ordinary martial artist with average talent accumulated in a year, accounting for one skill point.
However, in this world, there was a difference between geniuses and ordinary people. Some genius martial artists could cultivate for a day, equivalent to an ordinary person cultivating for a month, or even three months, or one to two years.
The disparity in talent also resulted in differences in cultivation levels. The higher the talent, the faster the accumulation of cultivation, the quicker the breakthroughs into higher realms, and the richer the inner cultivation.
This book was not one of those completely invincible stories where the protagonist overwhelmed everything from the start. The protagonist was invincible in the world but not without rivals, considered semi-invincible. The protagonist still needed to cultivate.
The author believed that if the book were completely invincible, there would be nothing to write about once the protagonist appeared, which would be quite boring.
Specific circumstances could be experienced by readers through the story. The author, being a newcomer, would inevitably have some inadequacies, hoping for everyone's understanding and grateful for everyone's support.