The term 'Zealous Ones' can be solved by the crossword answer 'DEMONS', which is a 6 letter word. DEMONS are supernatural beings that are often associated with evil and chaos. They are typically depicted as malevolent entities that seek to cause harm and destruction. In some religions, they are seen as servants of a higher power, while in others they are seen as independent agents of chaos. In any case, they are often characterized as being zealous in their pursuit of their goals.