its really hard to kill. taming however is very hard. Make stone walls and make them five tall and more if you need to.then make its length and with large enough for the titanosaur to fit through then atack the titanosaur with an argy to make it follow you intothe pen. then get your frend to close up thecage behind the titanosaur. then once hes traped make a tower next to the cage out of reach from the titanosaur. then shoot the thing until its knoked out.
put your structure resistance to max. if your on a server use metal walls insted.