Knife Piece 1

Knife Piece 1 is a passive item added in The Binding of Isaac: Repentance.

Effect

 * Spawns a knife handle familiar that follows Isaac.
 * Generates a room in Stage Mines icon.png Mines / Stage Ashpit icon.png Ashpit II for to spawn in.
 * Collecting both Knife Pieces, grants a knife familiar that launches forward when Isaac shoots, piercing enemies and dealing heavy damage. It can be used to open the red door leading to Mausoleum Mom's Heart, upon which it will be consumed.

How to Acquire

 * A white fire place will be present in  /  II. Touching the white fire place temporarily transforms Isaac into . Another room on the floor has a mirror, which Isaac can enter while a ghost. Walking through the mirror will teleport Isaac to the Mirrored world. The Knife Piece is in the mirror world's Treasure Room. After acquiring it, Isaac can return to the normal floor by walking through the mirror again.
 * The mirror floor is technically a separate area to the normal floor with an identical layout, meaning all rooms will not be cleared, and that destroying obstacles in one area has no effect on the other.
 * No other items or pickups naturally spawn in the mirror floor, although they can still be generated or awarded for clearing a room.
 * If the character is, , in his Lost form, 's Soul, or any character upon using , the mirror can be entered without interacting with the white campfire.
 * Since Tainted Forgotten does not need to interact with the white fire to enter the mirror, their normal health remains intact.
 * Despite the Soul of the Lost only lasting for one room in most circumstances, when used to enter the mirror, the Lost form will be kept until Isaac leaves the mirror world, meaning Isaac cannot keep his health on his way to obtain the Knife Piece.
 * Should the player use a on this floor, it's possible (though useless) to acquire two separate Knife Piece 1s.
 * However, the spare Knife Piece can be rerolled just like any other pedestal item.