Ouija Board

Effect

Grants spectral tears that travel through obstacles (but not enemies) instead of breaking on impact with them.

The Parasite: When tears pass through solid objects, like rocks, they will split, resulting in many tears shooting out from every rock the original tear passed through.

Brimstone: Aesthetic only, no effect.
- (Azazel) Azazel: Only cosmetic effect.
Dr. Fetus: Bombs will become transparent and pass through objects, just like spectral tears do.
Epic Fetus: No effect.
(The Forgotten) The Forgotten: Useless on both characters, as the bone club can hit through obstacles and The Soul has spectral tears passively.
(Added in Afterbirth) (The Lost) The Lost: Useless, as The Lost starts with spectral tears by default.
Mom's Knife: The knife becomes transparent but otherwise, Ouija Board has no effect.
(Tainted Lilith) Tainted Lilith: Hardly useful, as most damage is done through Gello whips.
Technology 2: Allows the laser to go through objects, allowing piercing and spectral "tears".