Finger!

Finger! is a passive item added in The Binding of Isaac: Afterbirth †.

Effect[ | ]

Spawns a floating finger familiar that can be aimed with the fire buttons in all directions.
- The finger fires invisible spectral lasers, doing 10% of Isaac's Damage. The lasers fire 10 times per second and are not affected by Isaac's tear rate.
- The lasers have thickness based on Isaac's Damage, making it easier to inflict damage on higher Damage.
- While not being aimed with the fire buttons, the finger points in the direction of movement or downwards if standing still.
The Finger!'s lasers can apply Isaac's Tear effects, which makes status effects trigger very often.

Finger! will fire in the exact direction it's pointed, meaning it can be fired diagonally, or at any angle, if using a controller - the same effect as Analog Stick.
The beam can be used to destroy TNT (among other destructible obstacles).
The Finger! does not do contact damage.

BFFS!: Doubles the finger's damage, but does not affect its lasers' thickness.
Box of Friends: Adds another finger on top of the previous one, effectively doubling its damage.
Finger!: Multiple fingers will stack on top of each other and move simultaneously, effectively boosting the damage of the original one.
- Having too many fingers can cause the game to lag.
Guppy: Flies are generated from the damage the finger does.
Ipecac: The finger gains massive damage boost as expected.
- The finger can poison enemies.
Proptosis:
- Almost doubles the finger's damage as expected. Has no damage penalty with range.
- Triples the finger's damage, but does not affect its lasers' thickness. Has no penalty with range.
Sulfuric Acid / Terra: The finger has a chance to destroy rocks when pointing at them.

Godhead: Only increases damage.
Terra: Causes the finger to constantly destroy obstacles in its line of sight.
Homing tears: The finger's lasers do not become homing.
A Lump of Coal: No effect on the finger's damage.
Marked: While actively aiming, the finger behaves as normal and while fire keys are not pressed, it points towards the targeting crosshair.
Trinity Shield: When not firing, the finger will point towards the nearest cardinal direction as to where the shield is left. This favors the vertical directions when the shield is at a 45° angle.
Trisagion: No effect on the finger's damage.