Vergil descended the dune without changing his pace.
There was no reason to surround the clearing, prepare an ambush, or try to find another entrance. The signatures were beneath that place, hundreds of them compressed into a relatively small region, and none seemed to be moving. If Niddrog was there, he would deal with her. If she was not, even better. His objective remained the same: get the Valkyries out of that place before anything else happened.
Nivara walked on his left, constantly watching the open cavities between the roots. Crymsaria did the same on the opposite side, although her attention alternated between the smaller dragons still following them from a distance and the deep marks scattered across Yggdrasil's wood. Itharine remained slightly behind, letting her own shadow travel across the ground and enter some of the cracks through which smaller creatures might try to approach. Qliphoth was the only one still looking more at the World Tree than at the nest.
