The Coliseum was at the edge of the Green Silk Town so the distance between it and the Tando Woodlands wasn't much. Ning Xi would have reached there quickly but she was carrying 49 people with her so her speed was slow.
Nevertheless, it didn't take long for her to see the periphery of the Tando Woodlands and the giant Rune Formation that made the designated Zone for the battle royal. It was vast, covering an area more than even the Green Silk Town.
Blue pillars rose from different parts of the forest and were connected with each other through a semi-transparent blue screen like barrier. The barrier was circle shaped and looked very sturdy as if nothing could pass through it.
It was a Tier 4 Rune Formation that many Runemasters had made spending many days. It was to ensure that nothing and noone could travel through the barrier. In a way, it was to safeguard the disciples from the unknown Spiritual Creatures that might wander inside the designated zone.