Qualifications of the Grand Master location (Prisma Valley)

Clue

People gathered to see the Grand Master's Trial were talking loudly in groups. "A test to decide the Grand Master?" "What does a Grand Master do anyway?" "Well, maybe you can find out about it at theGoldfish House in Changhun

Story

"The Grand Master is a medium that connects Guardians and Humans," said Pahan, stroking his beard with a smile on his face. "Expertise in combat is not everything that matters. A Grand Master must be able to communicate with Guardians with a calm mind. Just like that beautiful daughter of mine. Hahaha!"