You can utilize the most devastating Bomb Formula imaginable. By replacing your Bomb's explosive contents with your Philosopher's Stone, you can change it into a Nuclear Bomb. You must use the Bomb's Explode property. This Bomb deals 10d10 + 100 Force damage instead of its normal Fire damage, and its explosion is a Sphere with a radius of 1 mile.
This Bomb completely destroys your Philosopher's Stone.