How did Caliborn destroy the Felt planets again??

He had to travel the core of each planet. There he would find a cueball bomb, he had to take the bomb out of the core to a very specific spot on the surface before it’s timer ran out (which got shorter with each planet he conquered). When the timer was finished and the bomb was in its designated location the bomb would go off pushing the planet into range to be pulled into the Black Hole at the center of the session.  If Caliborn failed to accomplish this with any of the planets he would automatically lose.