12 Monks
From Gigantic Wiki
12 Monks is a mysterious group whose members are mostly known as martial arts masters. There is very little information, beside that they sometimes appear on Sanctum Falls or their monastery is somewhere not far from it.
Known members of 12 Monks at this moment are Master Wei (supposedly the leader), Vuna-Theka and Blau-Grau. Wu was one the disciples of the monastery.