- Willo bounces around the room, akin to the Wisps.
- Willo has a set path, but will move slightly away from the player if they are close.
- Willo produces a purple aura. When standing inside of it, the player will gain a 30% increase in damage.
- Willo will fire a homing tear at a nearby enemy when the player takes damage.
- Willo's item concept used to be apart of the Pact of Radiance's bonus effect prior to the Sin Update.