1 Shopkeeper: The Philosopher’s Stone is a miraculous alchemical substance that can turn other materials into gold.
2 Shopkeeper: It can also cure any illness or injury, grants the possesser immortality and eternal youth, and allows one to transcend humanity and become a god.
3 Death of Insanely Overpowered Fireballs: SOUNDS LIKE A NERD’S FONDEST DREAMS. DOES IT ALSO ATTRACT MEMBERS OF ONE’S PREFERRED ROMANTIC GENDER/S?
4 Shopkeeper: Sure, why not?

Not only can Fireballs speak in ALL CAPS, he can include an abbreviated and/or slash in his sentences.

The Philosopher's Stone has a bunch of other properties, according to various legends about it. These include, according to referenced material in Wikipedia, the ability to:

• create perpetually burning lamps;
• transmute common crystals into diamonds or other precious gems;
• revive dead plants;
• create flexible or malleable glass; and
• create a human clone or homunculus.

The plants one would be useful for when you get the spinach out of the fridge and it's gone all slimy.