Sage Dinerken is a cautious man. He explains the behavior of the gods and how they interact with the world indirectly. However, he refuses to tell Avin why Eimelle is being hunted by Octum's Apostles because he believed Avin was not ready.
It also seems he is capable of foretelling the future through various signs given in the stars. He had the suspicion that Sage Lemuras had died due to an amber star burning down on the sky, and he was correct. This was the likely reason of why he was called the "Sage of Wisdom".
One of the main reasons of why Avin left Ourt Village was to go to Sage Dinerken. Sage Lemuras entrusted Avin with the task of delivering Kabessa to Sage Dinerken. They were able to reach Dinerken's Mansion, but were immediately attacked by Rutice and Bernard when traveling from Sage Dinerken's Mansion to Tibri Village. Rutice and Bernard then go to Sage Dinerken and threaten him to give up Kabessa, but Avin and Mile make it in time to prevent them from stealing it.