There is no thing, living or un-living, or that has lived or will live that hates
like the Nuckelavee. Accounts vary of this brutal Scottish fae, but each account makes clear the pure, unrelenting brutality of the thing, and it's only desire to devour and destroy.
If pursued by the skinless horse and rider, there is safety on the other side of running water. Cross a stream and it cannot follow, but it is difficult to outrun, brutal when confronted, and overall perhaps the most cruel and mindlessly vicious of the unseelie court.
If you are interested, a good site with more information on the monster is available here: [link]