Entomologist Manual is an unlockable active item in Beyond, a mod for The Binding of Isaac.

Turns Blue Flies, Locusts, Blue Spiders, and Arachnids into other versions of themselves.

Spawns 1 or 2 Blue Flies or Spiders.

Defeat The Lamb as The Researcher.

This item contributes towards the Bookworm transformation. Collecting 3 items from this set will make Isaac fire an extra tear 25% of the time.

This item contributes towards the Beelzebub transformation. Collecting 3 items from this set will grant Isaac flight, converts small enemy flies into Blue Flies, and permanently charms larger enemy flies.

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.

Entomologist Manual can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Entomologist Manual have been documented.

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

• Download Beyond from the Steam Workshop.