Clear through the zone until you get to the end where you need to kill King Klak'Anon. (Thankfully you get a break; he does not come down the stairs.)
If you need to deactivate the Power Cells...
Click the switches (located up on the top part of the landing facing the cells, go up the ramps), to kill the power cells. The combination to make the cells targetable is as follows:
A = down, down, up, up
B = down, up, down, up
C = up, down, up, down
D = up, up, down, down After you destroy each power cell a group of clockworks will enter the room from the hall. The order is:
First power cell destroyed: 1 flying clockwork, 1 walking clockwork
Second power cell destroyed: 2 flying clockworks, 1 walking clockworks
Third power cell destroyed: 2 flying clockworks, 2 walking clockworks
Fourth power cell destroyed: 2 flying clockworks, 2 walking clockworks & The Crimson Vanquisher
After you kill the second king, the Master Clockwork Protocol comes to life and tries to kill you, however he is stuck to the ceiling and cannot come down - you can range attack him or stand on the metal piece jutting out of the floor to melee him. Battle him down to 10% then use the energized gear you got from 2nd king to destroy the Master Clockwork Protocol's stoneskin. Now you can finish him off to get your update for the MCP power cell (non-item).
Head back to Princess Saphronia in Kelethin and see if the power cell works on Sir Gearheart.
Right-click on Sir Gearheart, and insert the MCP power cell.