Six Knights of Black

The are a group of warriors from the Demon Clan, whose strength was used by Stigma as a benchmark for the strength of the Ten Commandments.

Overview
The Six Knights of Black are mentioned by a member of the Fairy Clan while commenting on the strength of the Ten Commandments.

Members
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Trivia

 * A Black knight was a stock antagonist in Arthurian legend and tended to lack any motivation except as an obstacle to be overcome by honorable knights.
 * Black Knight was a nickname of the real life order Knight Hospitaller, on account of the black mantle's the order adorned themselves with.
 * The Six Knights of Black will appear in the movie "The Seven Deadly Sins the Movie: Prisoners of the Sky" to release in August 2018.
 * The canonicity of this group is extremely vague. Due to appearing in a film that is non-canon. Yet, the group itself was mentioned by name in Chapter 203 by stigma.