Below you can find the In early japan they were sworn to secrecy wore full black uniforms & masks & were experts at combat Jeopardy Words Answer. The answer to In early japan they were sworn to secrecy wore full black uniforms & masks & were experts at combat has 6 letters. This clue belongs to the Secrets category and is part of Jeopardy Word Level 652. If you scroll near the bottom you will find other clues and answers part of level 652