Hey everyone, I open this topic because I'm having issues achieving the trophy "Hunter of Hunters" ( Kill 5 boss creatures), or maybe I'm doing it wrong. 

I've read in a guide: "At power level 1,100 you can fight against Nemesis type bosses in the Warzone." 

Since I played it yesterday, I know with the patch there's power level anymore, I'm currently level 54.

I did all first 10 stages of first Warzone round and the tenth there was any "special" or different dungeon from the others, it was just a siege mission and I haven't found any boss. 

How can I solve it? I just keep repeating Warzone progress until someone shows up or I'm forced to complete Main Campaign a third time? 

I own the Season Pass so if there's any boss for this trophy let me know to achieve it asap. 

Thank you all!