Willo is an unlockable familiar in Revelations, a mod for The Binding of Isaac.

Grants a familiar that bounces around the room diagonally and has a purple aura around it.

Being inside the aura grants Isaac homing tears and ×1.3 damage multiplier, and also acts as a warming aura in frozen rooms.

The familiar very slightly moves away from Isaac when approached.

When Isaac takes damage, Willo shoots 5 homing spectral tears at the enemy that hurt him.

Willo will shoot at anything that is a valid entity, including Blood Donation Machines. It can even shoot at Isaac if he takes self-damage, but won't actually damage him.

The damage of Willo's tears is equal to DamageStat - (DamageStat - 3.5) × 0.5.

Activate a Pact of Frost.

Willo can be found in the following item pools:

The following tags are applied to this item:

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

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

• Check out the item description on the mod's external Wiki.
• Download Revelations from the Steam Workshop.