Capítulo 818: A Chance For Survival.

Apparently, Soverick is part of some kind of abomination and he may not be a battle sage monkey despite looking like one. At first, the first sage thought it was an attempt to infiltrate the plane by some unknown entity. If not for the fact that Soverick was the child of the plane then the first sage would have done everything to eliminate him. 

The fact that Soverick proved himself to be the child of the plane assured the sage that he was born in the plane and recognized by the Will of the plane. The trust of the collective consciousness of the plane in Soverick reduced the first sage's suspicion of him.