Mental Cultivation.

He sat down by the fireplace and meditated slowly as he recalled all the information in the scripture.

The Underworld Nirvana Scripture was a unique Secret Art that did not cultivate Qi or the Body, but the Spirit. This was quite rare in the Three Realms as there were very few Scriptures that focused on Spiritual Force and Will.

Meditating on the Secret Art would allow one to connect with the Underworld Realm. Their Spirit would then be infiltrated into the 9 levels of Hell and slowly by enduring each of the 9 chambers one would strengthen their Spirit Force and temper their Will.

It described that all practitioners cultivated their Dao Hearts, hence the stronger ones Dao Heart was the stronger he would be.

"As expected of a Supreme Scripture cultivated by Yama himself." Yao Yuan could not help but sigh. Even comprehending the introduction broadened his horizons.

From what he knew there were Four stages to cultivation; Houtian Warrior, Xiantian Master, Grandmaster and Martial Sage. He didn't know much about Dao Heart or what level it referred to.

His father Yao Shan was an Late stage Xiantian expert which is why he was able to sit comfortable in the City Manor as the City Lord.

As for Grandmasters, they were only found in the Noble Families and Royal City.

Martial Sages, however, were the stuff of legends. They were said to be invincible among Mortals.

Of course above the Martial Sage level were rumoured to be higher levels but they were not known to practitioners in the backwater kingdoms such as the Snow Eagle Kingdom.

Calming his mind, Yao Yuan slowly entered a meditative state as he initiated the Scripture. His Spirit slowly attuning itself to the first level of Hell, Ice Hell.

He felt himself enter a dark, cold and desolate plain surrounded by icy mountains. No life could be seen it seemed like all time was frozen to a halt.

The cold penetrated to his very heart and his mind went numb as he could no longer chant. Gradually he returned from the trance-like state, but he still couldn't help but shiver. The experience was unfathomable. He wondered who was crazy enough to do that willingly.