Round Worm

This article is about the monster. For trinkets, see Category:Worms.

### Found In

A **Round Worm** is an enemy introduced in the vanilla content of *The Binding of Isaac: Rebirth*. They appear from Chapter 1 to Chapter 4.

It will periodically burrow into the ground and pop up in different part of the room. If Isaac is in their line of sight when that happens, it will spit a blood shot in his direction.

## Variations

### Stage HP

 35
 0

### Found In

Like the Round Worm, the **Night Crawler** will burrow into the ground and appear somewhere else. When Isaac is within their line of sight, they will fire four short-range projectiles that spiral outwards.

### Stage HP

 10
 0

### Found In

**Roundy** is a type of Round Worm added in *The Binding of Isaac: Afterbirth* DLC.

Like the Round Worm, a Roundy will burrow into the ground and appear somewhere else. When it surfaces, it releases a small rock wave around it and fires an  shot towards Isaac.

The Roundy's rock wave and explosive projectile can kill other monsters including each other.

### Stage HP

 10
 0

### Found In

The **Ulcer** is an enemy added in *The Binding of Isaac: Afterbirth* DLC.

Like the Round Worm, the Ulcer will burrow into the ground and appear somewhere else. When it surfaces, if Isaac is within its line of sight, it will spawn a Dart Fly, but if there are 6 of them in the current room, it will start firing a blood shot instead. Ulcers burrow underground at a slightly slower rate than most other Worms, usually making them easier to attack.

### Stage HP

 20
 0

### Found In

The **Tube Worm** is a unique variant of the Round Worm found in  Chapter 1.5 and the Flooded Caves of Chapter 2. They are added in the Booster Pack #4 for *The Binding of Isaac: Afterbirth †* DLC.

Like the Round Worm, the Tube Worm will burrow into the ground and appear somewhere else. Upon popping out of the ground, they will fire a long-ranged arcing spray of shots at Isaac, attempting to intercept Isaac's position based on his movement. Unlike standard Round Worms, they can fire at Isaac even if they do not have a line of sight.

### Stage HP

 10
 0

### Found In

**Fire Worms** were introduced in *The Binding of Isaac: Repentance*.

Like the Round Worm, the Fire Worm will burrow into the ground and appear somewhere else. If Isaac is in their line of sight, they will fire a single flame at him. They can only appear in lava-filled gaps.

### Stage HP

 100
 0

### Found In

Found on the Ascent to Home.

**Tainted Round Worms** are much stronger and tankier versions of Round Worms. They are added in *The Binding of Isaac: Repentance* DLC.

Like Round Worms, they will pop out of random locations in the floor, but the Tainted Round Worm does so alongside multiple tail ends. The head and all the tail ends will shoot Isaac together when he is in sight; while the tail ends each shoot a small blood shot, the head spits a large blood shot which will split into 8 blood shots upon obstacle collision. The tail ends can be attacked to deal damage to the Tainted Round Worm.

They are only found on the Ascent to Home.

### Stage HP

 100
 0

### Found In

Found on the Ascent to Home.

**Tainted Tube Worms** are a stronger variant of Tube Worms only found in Downpour during the Ascent. They are added to *The Binding of Isaac: Repentance* DLC.

After popping up in a random location, they spit 4 spread-out  shots in the direction of Isaac.

## Notes

* Worms are immune to the effects of  and .

## Gallery

* A Tube Worm's appearance in Dross and stages outside of Downpour and Flooded Caves.
* A Tainted Tube Worm's appearance in stages outside of Downpour.
* Round Worm on Isaac's Last Will.
* Concept drawn for Round Worm.

## Trivia

* Round Worms are parasitic creatures in real life that can be found inside cats or dogs.
* Nightcrawlers in real life could refer to earthworms, although they don't look similar to the Nightcrawlers from *The Binding of Isaac*.
* Ulcers are a reference to ulcers, breaks in bodily membranes caused by sloughing out of inflamed necrotic tissue.
* Tube Worms were created by Kilburn, who later became the programmer and developer for the *Repentance* DLC.
* In real-life, tube worms are creatures that live underwater and anchor their tails underground, which may be where the Tube Worm from *The Binding of Isaac* got its name from. However, they don't resemble real-life tube worms.
* If a Tube Worm is spawned in a floor other than the Flooded Caves and Downpour, it will have a more Round Worm-like appearance with white skin (this can be seen naturally in Dross).
	+ Same thing occurs with its tainted variant, though it is impossible to see without the use of the Debug Console.
* The Fireworm first appeared in the *Antibirth* mod where its name was one word instead of two.

## References

1. ↑ Booster Pack #4 is Live! - r/bindingofisaac