When Arduin asks Ken why he will go to another universe, he says with an angry aura that he will go for revenge. Arduin realizes that Ken will go for evil purposes, wants to stop him, turns his arm into a dragon arm and starts attacking.
When Ken remembered those times, he got angry again and made a space cut, cut Arduin in half, resurrected him, joined the Shadow Army, and went to the place where the Universe Tree was.
Ken enters the building where the Universe Tree is located, and the guardians take out their swords and start asking why he came here. Ken does not want to tell the events he experienced again and decides to kill them.
However, the guardians can anticipate his powers and are prepared against him. Ken fends off the guardians' attacks using his shadow powers. The Guardians also fend off Ken's attacks using the powers of the universe tree.
During the battle, Ken kills the leader of the guardians and tells the others to flee. Since the Guardians see Ken's powers, they respect him and run away.
When Ken touched the universe tree, he felt a different power within the tree and took the energy within it by making a time cut.
He could now travel between universes without the tree, and by using that energy he managed to go to the universe he wanted.
Ken was surprised to find the universe in ruins. Buildings were destroyed, human corpses were brutally slaughtered, and most importantly, there were no people left on the planet. There were only zombies, and after Ken killed a few of them, he recruited them into his Shadow Army. He saw a sign on the ground and as he discovered to his surprise, 1000 years had passed since he died in that universe.
Ken went to the date 3421 by going to time wars and using his powers. At that time, he had planned to take revenge after he died. Because if he took revenge on them before he died, it would cause a time paradox and Ken would never die and be here.
While Ken watched the battle from afar, he replayed his own death and angrily sent the Shadow Army into the time war. He ordered them to bring his ex-girlfriend and former best friend alive and kill anyone left behind. Ken continued to fight to get his revenge.