Key Piece 1 is an unlockable passive item.
- Combined with Key Piece 2, unlocks the golden gate in the starting room of The Chest and Dark Room to fight Mega Satan.
- Increases the chance of finding an Angel Room.
- This item is a guaranteed drop from Uriel if not already in possession.
- The Golden Gate can alternatively be opened using Dad's Key, Get out of Jail Free Card or Mr. ME!.
- This item, along with Key Piece 2, can be rerolled into any item from the Angel Room pool.
- This item also counts as a familiar, meaning it takes up a familiar slot.
- Unlocking the Golden Gate with the combined key pieces and then restarting the floor with Forget Me Now or an I AM ERROR room will waste the key, which will not respawn.
- Will not be rerolled by D4, D100, or Dice Room effects.
- Will not be doubled by Box of Friends
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