What did it mean to have a " black basket " in the novel?

A black basket was a weapon or skill used by the protagonist in novels, comics, games, etc. The black color was usually described as a very powerful and uncontrollable weapon that could cause great damage. In different works, the meaning and characteristics of the " black basket " may be different, but it usually described a powerful attack and difficult to control combat skills. In some novels, the " black basket " might also represent a fierce struggle between evil forces and the forces of justice.