Spider Mod

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Added in Afterbirth

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

Effects[edit | edit source]

  • 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 battery or spawn a Blue Spider when a room is completed.
  • Added in Afterbirth † This item belongs to the Spider Baby set. Collecting three items from this set will transform Isaac into a humanoid spider.

Notes[edit | edit source]

  • For the sake of simplicity, all damage values shown are multiplied by 10 and rounded up to the nearest number.
  • 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.
  • Spider Mod shows the health of invincible enemies, holes created by Little Horn, and the golden statue of Added in AfterbirthUltra 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 enemy damage reduction or invulnerability, which means that the damage indicators for Mushrooms, Stone Grimaces, and similar enemies will be inaccurate.
  • Added in Afterbirth † If Isaac transforms into Spider Baby, it spawns a spider familiar who works similarly to Spider Mod.

Synergies[edit | edit source]

  • BFFS! BFFS!BFFS! Icon.pngIncreases the size and damage of familiars.: Makes Spider Mod bigger and increases the chance for Spider Mod to spawn a battery or blue spider. No effect on stat effect damage.

In-game Footage[edit | edit source]

Trivia[edit | edit source]

  • 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 on screen.


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