Basically I found a way to kill the therizinasaur. Start by having an army of trikes and go near to the therizinasaur and punch it in the f ing face and make it follow you and lead it to ur army and they will attack it. Manage to kill 5 therizanasaur at once.
If you find this thing RUN it took me out in two hits and completely demolished my home and murdered my raptor and my little otter cuddles please like to pay respects to my little cuddles kept me warm on the cold nights