Without using The Bee and CC to beat Terra I try to stay on the direct opposite side of one of the rocks that scatter the sides. Staying about 10 paces back from the rock it's self. Also, target the tentacles as soon as they pop up, the more of those there are the harder the fight gets.
if you have a second controller plug it in and make a guest character, give him all ur cash and park him in the safe spot on the cliff then just go at terra with everything u got, ull die but he wont heal or attack the 2nd controller, and you wont lose any cash
His tentacles drop enough ammo that u shouldnt have to refill anything but rockets.
There's a rock by the door when you first drop in. Blow the horn and turn directly arounnd. You will run to the ramp up to the door and then find a tall rock on the right. Behind that projectiles will miss and most melee will too. You will learn his pattern.