So Rob immediately took out the soul crystal. Once exposed to the air, the soul crystal immediately absorbs the surrounding death atmosphere like a sponge absorbing water. The aura of death in the ancestral mausoleum is very abundant. Within fifteen minutes of taking out the soul crystal, a blue flame appeared on it. Rob took out a soul-nurturing box and put the conceived soul fire into it. He was very satisfied with this speed. This was still outside the cave. If he entered the Rat Man Ancestral Tomb, wouldn't the speed be faster? Holding the soul breeding box and the soul water tank in his arms, Rob took the lead and got into the cave. Entering the ancestral mausoleum, Rob opened the storage space immediately, took out No. 7, and activated it regardless of the surrounding environment. More than forty seconds later, No. 7¡¯s eyes lit up with red light. With No. 7 standing in front of him, Rob breathed a sigh of relief and took out all the remaining soul crystals one after another. Four of them were placed on No. 7's body, while he held two in his hand. Then he took out all the spirit-nurturing boxes. The spirit-nurturing box is made of ordinary nan wood. It is just a body substitute for the soul to temporarily reside in. It does not need to be too large. The soul-nurturing boxes that Abbas placed in the magic tower also functioned as decorations, which is why they were made so large. Rob needs to carry it with him, so he will naturally make it as small as it is difficult to make. So each spirit box is only as thick as an adult¡¯s thigh and as high as a knee. Rob made thirty in one go. The soul bred from the soul crystal is introduced into the soul breeding box. The emptied soul crystals regenerate souls, and this process is repeated until all the soul cultivation tanks are filled. Then thirty soul-nurturing boxes and six soul crystals will continue to absorb the breath of death, and the souls inside will continue to grow. Taking advantage of the leisure time when the soul crystal was nurturing the soul, Rob observed the situation of the cave. It was a very spacious cave, in the shape of an upside-down bowl. The other side of the cave could not be seen at a glance. The highest point was about one hundred meters. about. About two kilometers away from Rob's location, a large number of corpses piled up into a hill. Looking up at the highest point in the center of the pile of corpses, there is a small hole, which should be the corpse dumping port of the ancestral mausoleum of the wise rat people. The entire cave was filled with vague smoke. In the smoke, countless black shadows were wandering near the corpse mountain, and clouds of black smoke were flying and hovering in the air. If you look closely, you will see that it is not black smoke at all, but countless tiny soul fragments gathered together. It's a resentful spirit. The sound of wailing echoed in the cave. With the appearance of Rob and others, resentful spirits noticed their presence one after another and moved towards them in circles and flying. Rob was overjoyed, this was simply bringing nutrients to the soul crystal. Wraiths are incomplete soul fragments, and they are full of paranoid thoughts. If undead creatures directly devour these wraiths, they will easily be affected by the paranoid thoughts in the wraiths. But the soul crystal has no scruples in this regard. It will restore everything it absorbs into the purest soul energy to breed the purest soul. The souls bred from the soul crystal are the kind that can be swallowed directly without worrying about backlash. The dark cloud-like smoke of the resentful spirit came over and circled around Rob and others, but as soon as it approached the soul crystal, the resentful spirit screamed and was sucked into it. The closer it got to the soul crystal, the greater the attraction. The farther away it was, the stronger the attraction. , you can still resist and struggle. So with the soul crystal as the center, the area within ten meters in diameter became a vacuum for the resentful spirits. All the resentful spirits that were close to this range were involuntarily attracted into it. However, the unintelligent resentful spirits do not understand that this area is their last resort, and they are still pouring in here, rushing towards Rob and others who are standing next to the soul crystal. Rob found that he seemed to have become a bait. He stood next to the soul crystal and could harvest a large amount of soul energy without doing anything. This kind of harvest was really refreshing. With the influx of resentful spirits, the speed of soul crystal birth also gradually accelerated. In less than five minutes, another batch of six soul fires were born, and Rob guided them into the spirit incubation box. In less than an hour, all thirty soul-nurturing boxes were full, and the next step was a longer period of soul-strengthening. The aura of death accumulated in the ancestral tombs of the Intelligent Rats for thousands of years is very large. It can be expected that in the near future, the souls in these soul incubation boxes will gradually grow into soul hearts. While looking forward to a bright future, a ferocious roar suddenly sounded from the depths of the ancestral mausoleum. The roar was low and hoarse, full of power and penetration. It came from afar, but it shook Rob's soul. Rob¡¯s heart sank. A creature that can make such a powerful roar is definitely not an ordinary creature.?things. Just when he was guessing what it was, a black shadow quickly and quickly reached the top of the corpse mountain two kilometers away. That was an Intelligent Rat Man, or rather an Intelligent Rat Corpse Witch. His body was thin and skinny, not at all the fat and solid body that the Intelligent Rat Man had when he was alive. Its skin glows with a silvery gray color, with a metallic sheen on the surface. Jumping dexterously, the wise rat-man corpse witch quickly jumped to the top of the corpse mountain, and then ran down in the direction of Rob and others. "It's a tin zombie." Cabrit reminded in a low voice. Undead creatures are mainly divided into three categories: skeletons, corpse witches, and undead. Undead creatures that only have bones are called skeletons, and they rely on soul energy to pull their bones to move. ??Undead creatures with bones and flesh are called corpse witches. Corpse witches are divided into two categories, the intelligent lich and the unintelligent zombies. The undead are naturally spirit bodies without bones and flesh. They are also the most advanced undead creatures, because all undead have wisdom. In addition to skeletons, corpse witches, and undead, there are some other special undead creatures, but they are relatively small in number and are special cases. No matter what kind of undead creature they are, they all have souls. Low-level undead creatures possess soul fire. When their soul flames grow into soul hearts, such undead creatures are called superior undead creatures. The iron zombie is a high-level undead creature with a soul heart, the strongest among zombies. In human records, this level of zombies is called the Corpse Witch King by humans. Unexpectedly, a Corpse Witch King was born in the Rat Man Ancestral Tomb. No. 7's body made a clanging sound, and suddenly it was raised half a meter higher. The entire body seemed to be agile and agile at first glance, which meant that it had entered a fighting state.