1.) Leave Fortuna through the elevator.
2.) Travel to the Temple of Profit and locate the Exploiter Orb.
3.) Eliminate the Coolant Raknoids following the Orb Mother and pick up the coolant they drop.
4.) Locate a fracture; they are cracks in the surface that shoot out yellow/orange liquid.
5.) Deposit coolant into the fracture. You can insert up to 4 coolant cells into one fracture.
6.) Defend the fracture till it’s sealed. Repeat this process.
Things to note:
4 coolants into a single fracture gives 7 points and is effectively the most efficient strat when doing Thermia Fractures. This will increase difficulty, so bring AOE/Crowd control frames to minimize risk of failure.
Alternatively, you can seal 4 fractures with one coolant. This awards 7 points and is easier, but takes more time.
Obtaining Thermia is vital, as it will enable you to do the Exploiter Orb Boss fight.