A black whip with multiple flails.
When picked up, gives Isaac bloody whip marks all over his head and face.
Increases Shot Speed by 23%, and increases range.
In Rebirth Cat 'o nine Increases shot speed and damage
- When used in conjunction with Brimstone, the amount of time the laser is on the screen is lessened (meaning less damage potential), without any real plus.
- When used in conjunction with Technology 2, Isaac shoots a tear along with the laser, but the tear goes at the slowest speed.