What is the coolest mythological creature out of one of the below? And why if you want...?

I like the banshee (or ban sidhe : Gaelic for woman of the burial mound). You seem to have left the majority of Irish mythos out (leprechauns, faeries, ...) a lot of Greek critters (nymph, dryad, faun...) not to mention Hebrew (sepharim, nephalim, djinn,etc.) Phoenix are really cool too.