Master Gurren

"Master Ceeran, can you tell me about the Kandrian Martial Master of domain techniques?" Rui asked.

"Hm? Ah, Master Gurren," Ceeran nodded. "I don't know too much about him, personally. I do know that he lives in South-West Kandria on a mountain in the Great Jravian mountain range, though it is said that he keeps moving around the vast mountain range to keep people from approaching him. If you're interested in speaking to him, you will have to find him yourself."

"Oof," Rui winced. "That's rough."

The Great Jravian mountain range was called 'great' because of its enormous vast expanse extending thousands of kilometers across any direction. If Rui was going to have to find a single Martial Master across this expanse of mountains, he was going to have to scour every ounce of the entire region with his senses.

Also, if the Martial Master did not want to meet him, then Rui highly doubted he would be able to find him.