Susabo

Susabo is the Genius of Voyages and known as the "Ocean Barrier." His ability prevents people from traveling between server territories by ocean, which is necessary in order for Kanami's Party to travel to Yamato, and for Raynesia's party to reach China to assist Krusty.

He will be fought in Volume 15: Coppelia, Tiered Island.

Trivia

 * Information on Susabo was first revealed in the Log Horizon TRPG's Database before it was added into the light novels.