Fractal Key is an unlockable active item in Godmode Achieved, a mod for The Binding of Isaac.

On useGrants 1 Broken Heart and 1 Faithless Heart.

Has a chance to replace pickups with their golden variants following the formula (gilded chance):

N = total number of uses
X = granted chance
if N <= 0: 0%
if N < 5: 10% - (N - 1) * 2%
if N >= 5: 5% / (N - 3)

For example, the total chance to replace a pickup is as follows per use: (10% → 20% → 28% → 34% → ...<39%).

While heldAll golden pickups are replaced with 3 random versions of that pickup.

If another golden one is rolled without this bonus, this could lead to a chain reaction but the chance this item grants does not apply to this split.

The chance that this item grants will decrease by 1% for each new, uncleared room entered.

If using this item would kill Isaac via Broken/Faithless Hearts, instead turns this item into the Inverse Key and causes Isaac to explode.

Defeat The Fallen Light as Tainted Cain.

Fractal Key can be found in the following item pools:

• Check out the item description on the mod's external Wiki.
• Download Godmode Achieved from the Steam Workshop.