The Orb is a magic weapon found only in Blood II: The Chosen, clearly inspired by the Sentinel Spheres of the Phantasm movie series. It is a small metal ball with protruding razor blades. The Orb works by flying out and attaching to a victim's head. It then bores into the skull. It does not need to be terribly accurate, but does not cause great damage. It especially ineffective on enemies like the Behemoth, and is mostly meant for stealth and surprise attacks. This is Ishmael's signature weapon.
The instruction manual states that this is a Cabal invention, and describes it as an "inside-the-egg scrambler". The alternate fire takes 200 Focus, which Caleb does not have. Many players would not know that the Orb had a functioning alt-fire unless they played the single player campaign as Ishmael or Ophelia, BloodBath or in The Nightmare Levels.
AMMO TYPE: None (Focus)
REGULAR FIRE: The orb flies out and attaches to a victim's head, causing damage until it explodes
ALTERNATE FIRE: Switches to an "orb's-eye-view", where the player can control its movement, seeking and attacking victims anywhere on the level. This also leaves the player vulnerable.