If you have bad aim: Do NOT use cannon. Trap it with metal behemoth gates. Fly up to it on griffin or quez with platform saddle and hit it in the head with a rocket using a rocket launcher. Log out. Log back in. Hit it in the head with a rocket again. Repeat for every hit. It will take a long time because rockets only deal 200 torpor. Once it is out put the saddle on it and you are done. If you do not log out and back in after every hit then it will not work. Note: I play on mobile in solo player so pc users, I hope this works for you!