Arcworm

The Arcworm is a hostile melee mob from the Shyrelands.

Spawning
Arcworms do not spawn naturally, and instead are spawned when an Arcflower is killed.

Behavior
Arcworms are melee mobs that will follow targets both on land and in water. They will initially attempt to avoid getting into the water where possible, but will go in if they find no other path to their target.

They are aggressive, and will attack nearby players within 16 blocks without provocation. If attacked by another entity, they will retaliate and continue targeting that entity.

Arcworms are first found digging around underground in the Shyrelands, with their Arcflower exposed to the surface. If the player destroys the flower, the Arcworm will dig up to the surface and attack.

Staying outside of their targeting range will prevent them from attacking or targeting entities.

Classification
Arcworms are classified as Arthropods, and as such the effects of Bane of Arthropods will apply to them.

Arc Flower
The Arcflower is a hostile mob appearing as a flower from the Shyrelands. It is appearingly the top half of an arcworm, which will burrow out of the ground to attack players that attacked it.

Spawning
Arcflowers can spawn anywhere below y = 35 in the Shyrelands.

They will despawn if the player gets too far away from them, or if the difficulty is set to Peaceful.

Behavior
Arcflowers will pursue and attack players that come within 16 blocks of them. When the player kills an arcflower, the arcworm it was attached to will dig up out of the ground and attack.

Arcflowers are stuck to the ground, and cannot be made to fly or levitate.

Drops
Arcflowers have no unique drops except vanilla experience.

Arcworm
"This cute little creature is a timid caterpillar-like animal that prefers to spend its time underground. While it does have functioning eyes, it additionally uses vibrations to detect nearby entities and threats.

When un-threatened, it buries itself underground just deep enough to have its body covered, remaining close enough to the surface to breathe as required. Because of this shallow depth, its head-appendage remains above the surface, appearing like a native flower.

Once spotted, it will pop to the surface and charge at the target and bite. Its soft body doesn't offer much offensive strength, but it makes up for that with its tenacity."

Arcflower
"Arc Flowers are actually Arcworms using the ground to hide from predators. Cleverly, the arcworm has evolved a growth on its head that looks very similar to nearby flora. It then buries itself underground and relies on vibrations to find prey.

When it senses it is being target, it immediately stops movement and waits until it feels it is safe to move again.

When not staying still, it will sneak up on prey and attempt to eat them feet-first. Unfortunately it doesn't seem capable of determining whether a target is small enough to actually be eaten before attempting to do so.

If hit in retaliation, the Arcworm will immediately come to the surface and begin attacking"