280623
The herald demands Arthur swear immediate fealty to Matur , explaining that his country is defended by the contrivances of an inventor who has created a mobile palace carried by war elephants , invincible giants ( of whom he is one ) , and a mechanical dragon whose scream is so intolerable that it makes even the staunchest fighting men cover their ears , rendering them useless .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None