Nuckelavee, nuckelavee, you're big and evil and heinous.
Who could it be that set you free?
He really must be...
Yeah. And I've had the chance to read the module. Ain't the fey just the cutest monsters ever?
Along with being adorable, it's about as tough and dangerous as one could hope for its intended level range. (No vulnerability to fresh water, unfortunately. Pity.)
And...yeah, I referenced
The Bard's Tale. So sue me. Yes, I'm aware that the nuckelavee predates the game by centuries; I'm also aware that most people don't know that.