first talk to steel titan then go to lvl 53 wild next to gate on top of a hill and talk to lava titan go to chaos alter talk to geyser titan then go to barb village talk to moss titan then tele home talk to steel titan again and prepare for a annoying fight with a monster with like 600 def and like 700hp after you beat it drops a stone take the stone to steel titan and he will give you g maul