If you encounter a wild one of these on the mountain you are trying to mine in, once you have a Quetzal with a saddle, these guys are actually pretty easy to negotiate with. All you have to do is get it to notice you, and then kite it downwards until it either slips the rest of the way down or finds a prey item. You will have gotten rid of the beast without even provoking it, and both sides will have parted peacefully.
Oh so you want to kill it. It’s one of the most powerful wild creatures in ark. It has tons of health, hits like a MONSTER TRUCK, and easily murders everything. Oh how do you kill it then? Easy. Just lead it into water. Gigas can’t swim so it’ll just drown