The Parasite

The Parasite is an unlockable passive item.

Effect

 * Tears split into two tears on impact with obstacles or enemies.
 * The split tears deal 50% of Isaac's normal tear damage.
 * If one of those split tears hits an obstacle or enemy, it will split again and deal 25% of Isaac's normal tear damage.

Synergies

 * Compound Fracture - Both tear split effects happen simultaneously.
 * Cricket's Body - Two groups of this item's four tears, creating eight additional miniature tears on every point of impact instead.
 * Piercing Tears - Split tears form for each hit as the tears pass through the enemy.
 * Homing Tears - The split tears will be more likely to hit enemies.
 * The Ludovico Technique - Repeatedly spawns miniature tears when on top of an enemy, greatly increasing damage.
 * Spectral Tears - When tears pass through a solid objects, like rocks, they will split, resulting in many tears shooting out from every rock the original tear passed through.
 * Tiny Planet - The split tears will continue to orbit Isaac, increasing damage potential.
 * Tractor Beam - The split tears will be forced directly forward, impacting whatever caused the first tear to split. This increases damage immensely.
 * Jacob's Ladder - Each split creates an electrical burst.

Interactions

 * Bob's Rotten Head - Two further explosions appear perpendicular to the head's direction of travel when it blows up.
 * Brimstone - No effect.
 * Dr. Fetus - Bombs turn orange and with no other effect.
 * Bombs split into two bombs upon detonation.
 * Epic Fetus - No effect.
 * Ipecac - The Ipecac tear will spawn two smaller explosive tears when it collides with a solid object, but not with an enemy. These tears can spawn tears on their own as well, potentially leading to huge chain reactions.
 * Mom's Knife - Knife turns orange with no other effect.
 * Rubber Cement - Tears only split when hitting enemies and no longer off the wall or the floor.
 * Technology - No effect.

Trivia

 * Mega Satan shoots brown tears that split like this item does.
 * This could also be a reference to the anime with almost the same name due of similar looks.

Seeds
FR6X 2BGZ (Adjacent to spawn) XX1T QXN1 (Adjacent to spawn) NZ7X G61B (First treasure room)