| Floors of
| Base Health||22 (Per Segment)|
|Items Dropped||Boss Pool|
The Hollow is an enemy in The Binding of Isaac: Rebirth that is present as both a Boss on The Caves and The Catacombs floors and as an Monster during Boss Rush and on later floors. It is the posthumous variant of Larry Jr.
The Hollow's segments behave much like Larry Jr.'s, each of these segments having their own health and being controlled by one lead segment. When one segment is destroyed, all segments that were previously connected to the destroyed segment will turn into a new Hollow, but this is only if there are at least two segments left. If only one segment has been separated from the rest, it will automatically be destroyed. The Hollow flies about the room in a diagonal pattern, bouncing off of walls and dealing contact damage. Like Larry Jr., The Hollow commonly spawns as two entities, but may spawn as one large being. Also like Larry Jr., The Hollow will randomly defecate.
The Hollow has two Champion variants. These variants and their effects on The Hollow are as follows:
- The Hollow will be green and will occasionally stop to shoot 3 tears in a tri-pattern in the direction that the lead segment is facing. This version may also spawn a Charger upon the death of a segment.
- The Hollow will be gold and will sometimes drop a Coin upon the death of a segment.
- The Hollow will be black and spawn a Boom Fly upon being killed.