The followers of the death god obtained great knowledge, knowledge that even the Fallen Dead Sun never had access to it. Since the creations of people of a lower region were always discarded as primitive he never had any hopes for the Book of Death to ever amount to much.
However, he was completely flabbergasted when his clone was not only capable of rapidly climbing through the cultivation ranks, he also achieved an incredible understanding of the Dao of Death.
Shi Situ's first encounter with Shen Bao ended miserably for him, even though he had him in a well and firm trap he managed to overturn the entire thing against him and beat him at his own game.
Later on they had met once more in the Poison God's Trial, and ended up dying to the plan of Shen Bao which he orchestrated while Dao Shen was used to devour the body of the failure.
Shi Situ didn't despair or feel any anger, after all, he had already understood what Du Shen the author of the book wanted to relay via the Book of Death, and he had already taken several steps before towards the Dao of Death, so by simply application he was more than capable of understanding that Dao and applied it to further increase his own synchronization with the Death Dao.
Sadly, it was too late for him and it could only help him improve his cultivation slightly and increase his lifespan. If he had discovered the Book of Death earlier he would have definitely succeeded in his experiments and wouldn't have been degraded to his current status.
Yet, as a Sun stage cultivator, he didn't despair. And slowly continued his research on Death. His endless army of walkers born from the corpses of his own people were already roaming the land, but now thanks to the knowledge of the book of death they have a better chance at becoming something better, but they weren't his main goal of action anymore.
Shi Situ approached his lab and pulled out the corpses of the Raksahsa, he then began reanimating the weaker ones using his own Death Dao which turned those that died to walkers.
The Rakshasa were easily animated, and it was no surprise to Shi Situ since they never harbored a Soul and walkers needed no souls to move.
The corpses began standing up, their feral instincts still active and their aggressiveness became ten times the norm.
However, the same problem applied to them the same as it did the normal walkers.
"I'll be showing you how to use the Noble Black to command the rest of the Rakshasas, learn well," he said and began moving his hands creating gestures and speaking in an unrecognizable tone.
The words that came out of his mouth were only understood by the disciple and what appears to be the Black Noble as it lifted its head up sniffing at the air and then began growling lowly and then peaking its voice.
The disciple watched as the live rakshasa was rapidly affected by the command of the Noble Black and arrived to the feet of the Death Sun, it knelt down and waved its tail like a playful dog.
"Do you see?" the Dead Sun asked.
"This... this is incredible, master, you're able to control the alien race?"
"Not only that, I'm able to control the live ones, if I were to obtain the corpse of their ruler, their queen or king, I'd be able to control the entire hive. With that many rakshasa at our disposal, I'll be able to take over the beyond and force the other eight to open this damn door."
The eyes of the Dead Sun were once again glancing at the massive door on the other side of the cave, it was a powerful passage that needed a key, and that key would never be willingly given as it would cost more than the energy a sun can provide unless on death's door.
"Then we need more corpses, how about I send in more walkers above us, the child named Shen Bao, had killed many of them, and the corpses littered the ground for a long time before the rakshasa withdrew taking them with them."
"No need for now, we'll have to do that when the rakshasa come again," the Dead Sun said..
"Are we sure they'll attack the Sea of Demons?" the disciple asked
"Of course, since he is the weakest and this is the land with the least concentration of powerful cultivators, the Rakshasa will come in with the bulk of their forces to liberate it and make it a foothold. For now we cannot reveal our presence, and we'll only steal the corpses for our own use later on."
"As the master commands, For the Dead Sun," the Disciple said as he backed away.
Shi Situ was left with more live rakshasa that approached, they looked at his scrawny corpse but never thought of him as weak, for even the rakshasa knew what death looked like, and this man, was almost an exact copy of it.