William Massachusetts

Race: Elf

Class: Assassin

Subclass: Hunter

Guild: Silver Sword

[Spoiler] Name: Nakayama Masashi

Age: 16

Birthday: July 27, 2002

Occupation: High School Student [/Spoiler]

William Massachusetts, also known as Eyes of Mystery William, is the guild master of Silver Sword guild. He was invited to be a member of the Round Table Alliance but declined, stating that its goals had nothing to do with him and his guild.

(Source: Log Horizon Wikia)