Watery Hall
Proceed out of the Save Station to the Watery Hall. Directly to your left is a ledge. Climb upon it, turn to your right and begin working your way up the room along the ledges around the perimeter of the room. Various hazards will present themselves. Proceed to the Energy Core (Path: East Atrium, Energy Core Access, Energy Core)
Energy Core
Scan: Stone Toad
Oh hey, look. An actual challenge requiring directions: You want to get to the door at the other end of the room, don't you? And yet the room is filled with acid water. DO NOT jump in the water. It's deep.
As you enter to the room, there are two paths open in the walls of the room, one on either side. You want the left one. (If you go right, you'll understand why.) At the end of the path, you find a morph ball slot. Enter the rabbit hole, and proceed to the Burn Dome via the Burn Dome Access.
Burn Dome
It's a miniboss (we think). Destroy it and you'll get the Morph Ball Bomb.
Incinerator Drone
This is actually a two party miniboss: the first party is the Incinerator Drone. It shoots fire around the room. Occasionally it pops up an electric eye which is its weak point. The second party is a massive War Wasp Hive. It's huge. There's no way you can get rid of it with mere missiles.
So. Avoid the drone's fire by focusing on the center and circling in sync with it. When the eye comes up, refocus and fire. You have to hit the eye directly. Wounded, the drone sends a blast of fire directly at the hive, damaging the hive, and sending out angry War Wasps. Now you have wasps to fight and a blowtorch to avoid. Wash, rinse, repeat. Eventually you'll finish off the drone (4 rounds), and coincidentally, the hive will be destroyed at the same time. All that's left is your Morph Ball Bomb upgrade. Happy Birthday.