D12

D12 is an unlockable activated item added in Afterbirth.

Effect

 * Re-rolls all obstacles (including Marked Rocks) in the current room into others.

Strategies

 * The D12 can be used in big rooms with lots of obstacles to maximize the chance of obtaining helpful obstacles such as rainbow poop, golden poop, and tinted rocks.
 * Combining D12 with A Card Against Humanity in big rooms will maximize the number of re-rolled obstacles.
 * The D12 can be used to access otherwise unreachable spots or items (for instance, when they are surrounded by metal blocks).
 * The D12 helps in rooms where red poop is a major hazard.

Seeds
YL6N 8KK4 (Treasure room above spawn)

D12