King of Swords is an unlockable consumable in Fiend Folio, a mod for The Binding of Isaac.

Grants BFFS! and Hive Mind for the duration of the floor.

Converts Blue Flies into random Locusts.

Converts familiar Dips into rarer variants.

Converts Blue Skuzzes into rarer variants.

Have all of the following unlocked: Horse Pills, Golden Trinkets, and Golden Batteries.

The following special synergies and interactions for King of Swords have been documented.

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

The following sounds are related to this consumable.

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