Since the battlefield was moving around as Henry and Hanson fought, they currently were not closer to the building. For that reason, it was easier for Olivia and the group to be able to approach it.
The moment that they arrived at the entrance, they realized that the huge amount of killing intent that they had been feeling all this while was actually coming from this building.
Additionally, they felt that this amount of killing intent was way above the one that they had been feeling all this while. This made them frown. They could not help but wonder what was currently inside of this building, something that was capable of causing the eruption of such a thick amount of killing intent.
After a moment of hesitation, Olivia stepped forward. She was the one who had come with the decision of entering into this building, and since she was also the one that was holding the highest position amongst the group, she decided to take the lead.