Which other Fantasy creatures do you wish would have been included in FIM?

[precious gem 47]

 

Which other Fantasy creatures do you wish would have been included in FIM? 

MLP FIM had a lot of Fantasy creatures already included in Equestria such as Gryphons, Dragons, Sea Ponies etc

But what creatures did you wish they would have included in the show that they didn't include? 

I wish they would have included a Kelpie as a villain. Kelpies are beautiful but very creepy and I think that one would have made a good villain, although it might have been a bit too scary.