Gives Isaac a spider familiar that burrows in Isaac's head, firing four slowing tears in addition to Isaac's normal tears.
The slowing tears deal 1.5 damage each, and are fired at a rate of once every 1.5 seconds.
These tears are unaffected by Isaac's damage and tears stats; they have fixed damage and fire rate.
Upon taking damage, there is a chance that Isaac's head will pop, spawning friendly spiders, and release the Intruder familiar, who will leap at enemies to deal contact damage, and fires four slowing tears towards nearby enemies instead of Isaac.
The spider familiar deals up to 4.5 contact damage depending on how fast it's moving and fires slowing tears twice as fast compared to when it's in Isaac's head.
The familiar lasts for the current room, and Isaac's head is reattached upon entering a new room.
This item belongs to the Spider Baby set. Collecting three items from this set will transform Isaac into a humanoid spider.