Their destination was a strange energy phenomenon on the border of the Rift, the massive spatial anomaly that marked the edge of the current battlefield. The fluctuations from the ongoing spatial anomalies in the region made it impossible for most sensors to detect, while the thick clouds of nebula gasses helped hide the advance of anything that came out from the other layers while inside the phenomenon.
It was a nightmare for tacticians, and there were few intelligent species living anywhere near it, but during the ongoing battle, it was one of the primary arrival locations for the enemy fleet.
Every species in the Anomaly Region believed that the Rift was the location where most of the enemy force was hidden, but it wasn't safe to inspect it, much less send in an entire attack fleet.