In the outer area of the magical forest generally, there are Rank-0 beasts and Rank-1 beasts. Similarly in the inner area, there are Rank -1 beasts and Rank-2 beasts and in the core area, one will find Rank-3 beasts. Even a peak-level Core & Soul Fusion realm expert wouldn't dare enter the core area of the forest. It is okay if they met one or two Rank-3 beasts but if one gets surrounded by multiple Rank-3 beasts then the only way out is death. So the Core area of the Magical Forest is typically untouched by human influence.
Vishnu plans to get familiar with the forest in the outer area first before entering the inner area. Fenrir is also nearing Rank -3 so he'll leave it alone to hunt on its own.
Outside the forest, they'll spend tonight and enter the forest tomorrow morning.