Oddly Smooth Stone is a trinket in Fiend Folio, a mod for The Binding of Isaac.

Every heart pickup heals for 50% more.

Only affects the following heart types:
• Heart
• Half Heart
• Double Heart
• Scared Heart
• Blended Heart
• Soul Heart
• Half Soul Heart
• Blended Black Heart
• Black Heart
• Half Black Heart
• Rotten Heart

The following special synergies and interactions for Oddly Smooth Stone have been documented.

* Note that not all possible synergies and interactions are listed here.

• Check out the trinket description on the mod's external Wiki.
• Download Fiend Folio from the Steam Workshop.