Board Thread:Tips, Tricks, and Questions/@comment-66.45.138.184-20131028052542/@comment-6459948-20131128080557

@Phonecalls: enraged bosses appear randomly after that point, its not gaurnteed to be the "next boss", and you dont always just get 1, Ive seen troops get everysingle boss after the 1/2 way point being enraged, and other troops (mine) only getting 1.

I havnt been able to figure out if there is anything that triggers enraged boss other than random luck.