Warhammer: the Return of Guilliman? Ultraman!

(The Emperor will wake up in the middle of the plot) "Robert Guilliman, I saw your brave behavior. Your courage to face a powerful enemy regardless of your own safety and want to save mankind on your own is very touching." "I give you my life, and together we will work to defend the peace of the galaxy and the freedom of mankind." "You are already Ultraman." This is the 41st millennium of mankind. Chaos Warmaster "The Great Despoiler" Abaddon launched the Thirteenth Black Crusade, destroying the fortress world of Cadia and opening a great rift across the galaxy. Countless powerful monsters and aliens entered their galaxy through the Great Rift, and these dangerous alien creatures also joined this carnival of war and killing. The light of the star torch on Terra has been extinguished. Aliens, demons and traitors are raging across the galaxy. People cry out in despair, as if the eternal night of the past has fallen again. But Cursed Scar brings not only enemies, but also hope. A huge planet made of green crystal appeared out of thin air in the Ultramar sector. The Imperial residents of the nearby planet called it the "Land of Light" and witnessed a huge alien race operating on it. The Primarch Robert Guilliman returns as a silver giant, vowing to kill the aliens and traitors and restore humanity to its former glory. Even the Lord of Humanity is gradually waking up from his slumber, trying to win over those alien allies from other worlds called "Ultraman", and start a final struggle with the dark gods. "Robert Guilliman, you are both light and human, do what you think is right."