i think you went the wrong way then or found a different way because i am redoing the game now and i didn't have to fight any troll

well im almost done with the game u need to fight el gigante (the big troll) the easiest way to kill him is the rocket launcher an grab his 15,000 pestas and go to the church.oh be careful their are wolfs that atack u the easiest way to oick them off is the shot gun.

with my Killer 7 at firepower 35.0 it took me 2 shots to kill him, to kill him normaly U. keep shooting its head then when he neels down run behind him then press A or climb then keep slising with your knife keep repeting this over and over about 3~5 times

Fighting this guy is easy. if you equip a poerful gun shoot him until he kneels down and a parasite comes out of his back. you can either shoot the parasite our climb the boss and tap A or b to cut it.

Hint: If you saved the dog from the bear trap at the beginning of the game he will come and help you by distracting the boss by barking.

All u do is shoot him untill he falls then you can press A to climb on his back and knife him which saves ammo but if u want to do it quickly u can shoot the parasite that comes out of his back which can do a lot more damage or shoot the parasite with a rocket thats a one hit kill