The Undead King panicked as he thought, "I can never go back there again, I don't want to get experimented on, and my level is too low." But at the same time, he wanted to live on, so he continued to run away from them as he went deeper and deeper into the cave.
Eventually, when he reached the fifth level, the others had finally caught up to him due to The Undead King's level being a little bit low; he ran out of energy quickly. But the others kept going because they had a few potions on them to recover their strength. The Undead King was lying in the middle of a big room tired, drained out of power, and breathing heavily.
The Undead King looked upon the arriving pursuers. The Owl Clan members said, "We are in a hurry, but since he is undead, we cannot kill him unless we have solar powers." That was when they decided to seal him within that cave. The pursuers noticed that when they had arrived, there were a lot of Undeads within that cave, and they thought that they could use them as experiments.
The owl clan representative didn't know if they killed The Undead King or whether his subjects would also die, so they decided to keep him alive. The Scorpion King told them that they should kill him anyway. He might escape one day, and if he does, they'll all be doomed, but The Owl Clan representative insisted that they keep them alive for experimental reasons. King Lar was pretty depressed that he was being tossed around with no control over his own life, but the thought of getting a second chance at life excited him.
As soon as King Lar saw that they were going to seal him in this little room in the cave, he got angry, but he was too weak to get up and charge towards them. They started putting up multiple barriers around the room, using magical signs the owl clan representative finished sealing the place after a whole week. The seal was finally done, and everybody left. King Spar left dejectedly as he said quietly, "this won't last very long, and that guy inside there is going to get stronger every time."
When King Spar said that n.o.body heard it, King Lar heard him as he was enlightened. He can use this opportunity to train and get to a higher level. That way, in the future, he will be able to exact his revenge on all those that did him wrong.
King Spar was leaving as he saw the smile on all The Undead. He s.h.i.+vered as he said, "I will also grow more robust and wait for your return." Now on this day, a few hundred years later, The Undead King had come back and was ready for his revenge.