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Enemies in the game include rats , ghosts who can walk through walls , dervishes who can steal a player 's possessions , snappers who remain dormant until disturbed , and mad mages , who shoot fireballs .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None