D12

D12 is an unlockable activated item added in The Binding of Isaac: Afterbirth.

Effect

 * Re-rolls rocks and metal blocks in the current room into rocks and their variants, poops and their variants, TNT, and metal blocks.
 * Poops of any type and TNT cannot be rerolled, although other obstacles may be rerolled into them.

Strategies

 * When used in rooms filled with obstacles, the large quantity of poops and TNT the D12 can create makes obtaining a large amount of coins and hearts, as well as the trinkets Counterfeit Penny, Petrified Poop, Match Stick, and Burnt Penny very easy. The penny trinkets can especially benefit from all of the coins generated.
 * The D12 can be used to access otherwise unreachable spots or items (for instance, when they are surrounded by metal blocks or when Isaac doesn't have bombs).

Trivia

 * This item functions almost identically to how the item of the same name works in the Antibirth mod.

Seeds
YL6N 8KK4 (Treasure Room above spawn)