Spider Mod
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Spider Mod is a passive item added in The Binding of Isaac: Afterbirth.
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.
This item belongs to the 
Spider Baby set. Collecting three items from this set will transform Isaac into a humanoid spider.
Notes
For the sake of simplicity, all damage values shown are multiplied by 10 and rounded up to the nearest number.
Damage values are no longer multiplied or rounded.
- If a hit would deal 10000 of more damage, it will be displayed as 9999.
- All stats effect damage dealt by Spider Mod is based on Isaac's damage stat.
- Spider Mod reveals
Mega Satan's health bar and is the only way to see his health.
- In Repentance, doesn't reveal Mega Satan's life bar during his second phase anymore.
- Spider Mod also reveals the health bar for
Mother, the Ultra Harbingers, and 
The Beast.
- Spider Mod shows the health of invincible enemies, holes created by
Little Horn, and the golden statue of 
Ultra Greed. - Spider Mod doesn't show if a segmented enemy has individual segment health like
Larry Jr. or a health pool like 
Chub. Against enemies with invulnerable segments such as 
Carrion Queen and 
Scolex, its indicators will not differentiate between damage dealt to invulnerable and vulnerable segments. - Spider Mod's damage doesn't account for damage scaling, enemy damage reduction, or invulnerability, which means that the damage indicators for some bosses,
Mushrooms, 
Stone Grimaces, and similar enemies will be inaccurate. - If Isaac transforms into Spider Baby, it spawns a spider familiar who works similarly to Spider Mod.
Synergies
BFFS!: Makes Spider Mod bigger and increases the chance for Spider Mod to spawn a battery or blue spider. No effect on stat effect damage.
Hive Mind: Makes Spider Mod bigger. Whether or not this impacts spawn chances or damage is unknown.
In-game Footage
Trivia
- This item is a reference to Spidermod, a modification to the original The Binding of Isaac, which was made by one of the lead Rebirth developers, Spider853. One feature of Spidermod was to show damage numbers onscreen.
 Spider Items
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| Items |
 The Binding of Isaac: Rebirth
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