After Knull vanished from the battlefield, the Celestials stood there again, spacing out.
Perhaps they were contacting their homeworld, perhaps they were calculating their next move. In any case, their target planet was gone, vanished in the light.
This awkward scene lasted around thirty seconds before light lit up in the Celestial robots' lenses again. The remaining robots descended to the bottom of the crater, then lined up and flew into the pink light.
Those enormous machines all turned into thin beams of light and vanished just like that.
After they entered, the scene remained quiet for another dozen seconds. Then the air nearby rippled, and Deathstroke, dressed as Knull, slowly emerged from thin air before changing back into his black-and-yellow armor.
He waved toward where everyone was hiding in the distance, signaling that they could come out, and specifically praised someone:
"Wanda, you worked well with me. Your illusion was perfectly timed."
In truth, it was simply an application of mechanics, plus a little sleight of hand.
When he slammed into the planet suspended in the sky, the force striking him had already been transmitted to the planet. Like Newton's Cradle, the planet was knocked flying into the 'door,' while he had actually stopped on this side of it.
The ice fog afterward had seemed to burst from the planet's impact, but it was actually a magical special effect intended to hide Deathstroke.
Perhaps the Celestials believed Knull had not died, or perhaps that planet full of Dark Celestials was important to them. The exact reason no longer mattered. What mattered was that they had entered the Transcendence Dimension and become cannon fodder sent ahead to scout the way.
"Okay, the Celestials are in. Adjutant, call in the Nuwali fleet. Have them take the Synthezoids to hold the line