Here let us begin:
LV 1--- pure patk boss
Lv2---pure patk boss
LV3---matk and patk boss, mainly patk
LV4---patk and matk boss, very high matk damage
LV5---pure Patk boss, very high patk
LV6---matk and patk, very high matk and low patk, eaiser boss than lv5
LV7-matk and patk, both very high damage, hard boss
LV8---pure Patk, very high damage and like to ignore ur troop and hit u really hard lol
LV9--- pure matk, pretty and deadly woman, haha
LV10--- pure matk, everyone's old friend now, meet it everyday ,lol, just hit us 10 times harder than its twins!!!
LV11--- pure patk, pure speed boost cute doggy, I dont think can pass it without 80k br lol, well, u know, doggy like hold the door haha!
hope this helps as i get more info on the higher bosses will post.
Edit: jpg file links removed for now. will post pics of bosses later.