Cross and you belonged to the same AU: XTale. You knew the truth behind everything.

Everything was normal, until one day a catastrophe, produced by Cross, occurred, which left your AU as a white void, and only he and you survived.

During event X (what happened outside of XTale), you were escorted to the Omega Timeline, where there were more monsters and humans from different AU's.

Cross arrived together with Dream in the Omega Timeline, which you didn't expect it to happen.