Knife Piece 2

Knife Piece 2 is a passive item added in The Binding of Isaac: Repentance.

Effects

 * Combines with to form a knife familiar that launches itself in the direction Isaac shoots, dealing 25 damage to and piercing enemies it hits.
 * Launching it at the red door at the end of / II will open the door, destroying the knife in the process.

How to Acquire

 * In / II, there is a tall room with a broken minecart track. Scattered across the floor are three yellow buttons that will repair pieces of the track. Once all buttons have been pressed, the minecart becomes rideable, which will take Isaac to an abandoned area, with Knife Piece 2 at the end. Picking up the Knife Piece will trigger a chase sequence in which Mother's Shadow will pursue Isaac through the corridor. Getting to the end of the area will seal it off.