Celebro did this because he knew that, given this Frontier Universe's location, reinforcements from the Land of Light would take at least twenty-four hours to arrive.
He had also laid ambushes along the route those reinforcements would have to take, so he was extremely confident.
Among the current Ultramen, only Dyna, Zero, and X could teleport directly and swiftly between universes. He had made preparations and gathered intelligence beforehand: X was currently fighting the remnants of the Ginga Empire.
Besides, even the Dark Radiant Sky Claw had been overwhelmed by the Final Angel. Even if X used the Beta Spark, he would pose no threat to him.
The Land of Light would surely have X bring several New Generation Ultramen along, too. With him having to find them one by one, the New Generation Ultramen would not arrive before his plan was complete.
That meant Reiga, whom he was somewhat wary of, could never appear.
As for Dyna, even in the worst-case scenario where he did arrive, his strength would pose no threat to Celebro as he was now unless he could fuse into Saga. Cosmos, who was already running himself ragged dealing with Devil Splinters in his own universe, was even less likely to make it.
Ultraman Tiga was the least likely of all. Celebro had spent a long time on this Earth and had found neither any stone statues that might contain Ultraman Tiga's power nor anything from his universe. There was not even the slightest legend about him.
One reason he had given humanity eighteen hours was that he wanted to savor how humans would behave in despair. Chaos, infighting, madness, even slaughtering one another-all of those were possible.
The other reason was that he wanted to break Zero's companions psychologically. If Zero was still conscious and