Spider Mod

Spider Mod is a passive item added in the Binding of Isaac: Afterbirth expansion.

Effects

 * Spawns a grey spider familiar that wanders around and allows Isaac to see tear damage and the health bars of all enemies.
 * The spider will inflict a random status effect on any enemies it comes into contact with.
 * The spider will sometimes drop a Lil' Battery or spawn a Blue Spider when a room is completed.

Synergies

 * : Makes Spider Mod bigger and increases the chance for Spider Mod to spawn a battery or blue spider. No effect on stat effect damage.
 * Makes Spider Mod bigger. Whether or not this impacts spawn chances or damage is unknown.

Trivia

 * This item is a reference to Spidermod, a modification to the original Binding of Isaac, which was made by one of the lead Rebirth developers, Spider853. One feature of Spidermod was to show damage numbers onscreen.