how do you make bosses?

I was just curious how u get the Bosses to come back to fight them again and again?

I see people saying they get legendary weapons from bosses but it could take a few hrs of killing them over and over to get them. How do they do this? Cause when I beat a boss thats it till my next play threw? 

 

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Last updated July 3, 2018 Views 3 Applies to:

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