familiar spirit
noun
1
                    
                                          
              
          
                                                      : a spirit or demon that serves or prompts an individual                                      
                
                    
2
                    
                                          
              
          
                                                      : the spirit of a dead person invoked by a medium to advise or prophesy                                      
                
                    
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  Merriam-Webster unabridged




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