Description
Dozens of small, pale green water demons with long brittle fingers, horns, and too many teeth, moving as one mass under the surface. They strangle what they catch.
Background
Grindylows live in lakes and sea caves across Britain and Ireland. One is a nuisance; a swarm that has taken a cave is a reason nobody goes in. Their fingers are strong but brittle, and the old advice is to break the grip rather than pull against it.