The Intruder is a familiar in The Binding of Isaac, added in the Repentance DLC.

Causes Isaac to fire 4 slowing tears in addition to his regular ones 0.68 times per second that deal 1.5 damage each.

Upon taking damage, there's a luck-based chance for Isaac's head to pop off and spawn Blue Spiders, releasing the intruder familiar.

The familiar will leap at enemies, dealing up to 4.5 contact damage depending on how fast it's moving, 4.29 times per second, and will fire 4 slowing tears instead of Isaac, 1.88 times per second.

The chance for the familiar to pop off goes up to 100% with 4 luck.

The familiar only lasts for the current room, and reattaches to Isaac upon entering a new room.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.

This item contributes towards the Spider Baby transformation. Collecting 3 items from this set will spawn a spider familiar that applies random status effects when it comes in contact with enemies.

The Intruder can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for The Intruder have been documented.

* Note that not all possible synergies and interactions are listed here.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

The Intruder

• Spider familiar that inhabits Isaac's face and fires quad shots of slowing tears in addition to Isaac's normal tears
• Chance when taking damage to spawn blue spiders and dislodge the intruder for the rest of the room
• While dislodged, the spider leaps at enemies, dealing contact damage and continually firing quad shots of slowing tears
• Abyss: x1 slowing locust 1x Isaac's damage

• Check out the item description on the external Isaac Wiki.