Flukemon

"Worm-like creature that prefers damp, dark habitats. Dangerous, unpredictable foes that infest the pipes below Hallownest's capital. Even when it seems you've killed them, you need to stay on guard."

Flukemons are enemies in Hollow Knight. They are earthbound Flukes who split into two living halves after being defeated.

Behaviour and Tactics
Meanders back and forth, emitting a suckling sound to signal its presence. Once it spots the Knight, it rushes forward at them, dealing damage on contact. It will hardly be discouraged and will keep rushing towards the Knight even if it is blocked by a wall. Can also detect when the Knight is above or below them, even when not provoked and in this case, it will stop wandering.

Shortly after its death, the top half reanimates. It emits a scream before flying at the Knight. The bottom half reanimates shortly after, making slobbering noises and running quickly at the Knight. It can run up on walls and, due to its speed and momentum, attacking it early in the game can be risky - if not killed in one hit, there is a good chance that it will run back faster than a second swing, therefore it is safer to down-strike it by jumping over its head.

Location
They can be found in Royal Waterways, mostly in the central portion.

Trivia

 * The individual halves of the Flukemon can not be Dream Nailed.
 * If the Flukemon runs into water it will have a unique animation where it cries out while slowly sinking into the water and eventually drowning.

References

Tremadora Тремомон Przywra Flukemon