Demon/Devil

What does a Demon/Devil mean in a dream?

A Demon/Devil in a dream can represent:
Symbol for Evil
Ruler of 'Hell'
Mindless cruelty / violence
Can be seen as asymbol of productivity.
'The Devil is in the Details'
'The Devil's workhorse'
The Devil is considered to be an unclean or malevolent spirit.
'The Devil is the master of Temptation'