These enormous worms, found in Cainhurst Castle, the Forbidden Woods, and the Nightmare of Mensis, are neothenic creatures (none of them have ever shown a traditional adult insectoid form), likely fly larvae which became Beasts themselves due to feeding upon contaminated corpses. They often burst out of the sacs of particularly large Bloodlickers and Silverbeasts, though it is unknown how they fit into the latter, given their size.
These beings are always found in groups and due to their extremely small size and speed, may often kill a hunter with lower health or many successive hits.
Making matters worse is that they are extremely resistant to most sources of damage but are very vulnerable to blunt damage.
As such, it is wise to either use a blunt type of attack with a weapon you have, or, ideally, use weapons that have many attacks with blunt damage, such as the Kirkhammer (in hammer mode), the Beast Cutter (both modes deal blunt damage), the Amygdalan Arm (in club mode) or perhaps even the Tonitrus or Boom Hammer (as both always deal blunt damage in addition to another element).
It is very reccomended to use the Beast Cutter though, as the strong attacks of the whip mode will allow players to kill these vermin from a safe distance.
- A Gigantic version of Parasite Larvae seem to be living inside of the headless variation of the Bloodletting Beast
- Two larvae will erupt from the Silverbeasts in the Nightmare of Mensis when killed.