Book of Swiftness is an active item in Furtherance, a mod for The Binding of Isaac.

Activate effect of Era Walk.

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

Book of Swiftness can be found in the following item pools:

The following tags are applied to this item:

• Download Furtherance from the Steam Workshop.