Philosopher's Stone (5e Equipment)
From D&D Wiki
Wondrous Item, artifact
As its name implies, a Philosopher's Stone is such an impossibly rare alchemical substance that the extents to its applications are the pipedreams of those who seek the truth.
This rare substance appears to be an ordinary, sooty piece of blackish rock. A creature may attempt a DC 20 Strength Athletics check to break it open, revealing a cavity at the stone’s heart on a success.
This cavity is lined with a magical type of quicksilver that enables any spellcaster to transmute base metals (iron and lead) into silver and gold. A single philosopher’s stone can turn from up to 5,000 pounds of iron into silver, or up to 1,000 pounds of lead into gold. This quicksilver becomes unstable after 24 hours after being revealed, evaporating into thin air.
If this quicksilver is mixed with any potion that restores hit points or removes conditions from a creature while the substance is still potent, it creates the Oil of Life. When the entirety of this oil is sprinkled on a creature, true resurrection spell.
Destroying the Philosopher's Stone. As detailed above, this stone is easily broken, and loses its power 24 hours after.