Leon lost the count of how many stars and planets that monster had destroyed. However, it doesn't matter. His attack was already ready, and so was Leon.
"Ilyana, watch my back," Leon said. "Whatever happens, we have to make that this attack will hit."
"Got it." Ilyana nodded.
If that doesn't work, Leon would be forced to summon everyone to that place. It would be insanely hard for his allies to fight in outer space, and many of them would be their advantage, but he wouldn't have any other choice. Leon couldn't summon them before using Big Bang at least once, after all.