Any level can join to boss battle?

Hm..its like Reid Boss in Linage ? or , im play at ninja joy jun , but this some new and diffrent , so im intresting this , but when you dont know anything in game its hard...

Any body , tell me what i need to do in game :D

tnx guys for answer (oh tnx girl :D ) 22 lvl , i remember , boss only one in game ? or its many ?

tnx Schnee :)

Im from Ukraine , im hard understand many english things :DD but i understand all , :)

Better if be all 10-teils bosses , and be party , when strong peoples attack , can any body give us screen how its in proccesed ingame?

tnx Candy :D

He allways changed players places , what that give him ? another combo ?