help

Ummm.... Every boss is humongus but my guess is you mean the giant crawler/roller-thing. Well to avoid getting eaten you have to run away when it gets of the building and is trying to get you with it's claws. Also kill all crawlers with the shotgun and keep firing the carabin at the monster and you should be fine. BUT you could also mean the other humongus one and there you have to fire the LAARK when it grabs you and when you are thrown to another biulding you have to go up and keep running through it when you reach the monster again and have to finish it with the LAARK.

Just shoot the levi in the mouth with the rocket when he grabs you. When he throws you through a bridge-walkway. Get the LAARK ready and fire one at him, wait until hes under the bridge-walkway then shoot the walkway. The explosion will make a giant hole in it's head, then shoot the hole with the LAARK, then it's over.

The leviathen will be tough for some people for the first try but just shoot him in the mouth when he trys to eat u. Then he trows you to a building and just follow thw waypoint until you come to a bridge fire a rocket at the bridge when hes under it. Then shoot the hole in his head weeeeeee!!!!its over!!!