After combining, P!Omega started to attack William. William didn't have time to react and was immediately hit by P!Omega.

-William :This guy's speed has changed. He has surpassed the barriers of space and time. We have to start getting serious.

As he finished speaking, William began to seriously catch up with P!Omega's speed. The two people's punches and moves collided, causing space and time to crack into thousands of pieces.The power spread out causing the surrounding multiverse to collapse. After a while of fighting, William was suddenly attacked by P!Omega, causing William's code to malfunction.

-William:Your negligence allowed you to attack my source code. But just because you attacked my code doesn't mean I have to lose to you.

After saying that, William's codes were completely restored in a short second. P!Omega was surprised at how fast the codes recovered, P!Omega said.

-P!Omega:Your power surprised me but I don't think I'll be afraid of you since I've only used a fraction of my power so far

After saying that, suddenly from P!Omega's body, the power increased 10 times more than before, causing fear in everything, including William.

-William:It's been threatening enough for us so it's time to use its true form.

After he finished speaking, William's power suddenly increased from William's back, a pair of butterfly wings grew out, everything around him was transformed into 404. Everything was nullified by this space, but P!Omega was not. The two began to use all their power. The battle lasted for a long time, but then William suddenly used the surrounding space to force P!Omega into nothingness. P!Omega no longer existed. After determining that P!Omega had been destroyed into nothingness, William revived Error thanks to the code stored in the data and went to another place with Error. But William did not know that P!Omega was still alive but no longer existed. Player and Omega separated after being destroyed, but they were still alive in nothingness.

-Player:Error 404 is indeed stronger than what I knew in Alphatale. Although we almost succeeded in defeating William, in the end we were both destroyed and turned into nothingness *embarrassed laugh*

-Omega Sans:so now we are wandering aimlessly in this void.don't know how to get back here damn it.

-Player:We can't go back now but I can still help us go back because I copied our data to the computer so we can go back from putting the data into Undertale and we'll go back to the game's Cutscreen.

-Omega Sans:For now, just listen to me.

After saying that, the two of them started waiting for the Player in the real world to save them both.
------------------End-----------------