I just finished The Flash Season 3 and certain things are unclear to me. As far as the TV show goes, I understood that Tracy Bran's Speed force Bazooka didn't work with Savitar because Savitar had the philosophers stone in hand.
Please forgive my ignorance of the fact that I have never read any Flash comics till now. I only watched the show.
So my question is:
What exactly is the connection of the philosophers stone with the Speed Force?