Uh, it's edgeofnever.net, Cyhiraeth.

There's a lot of room for interpretation in the unicorn legend (silver alicorns, gold alicorns, candy-striped, etc.), although Olde Worlde unicorns are usually depicted with beards. shadownet's unicorn does come with a beard and fetlock props (at least, my copy did).

Lyne, bloodsong, and Kacia have an embarrassment of riches for the Poser horse at PlanIT 3D, including Arabian, thoroughbred, and Friesian morphs, a working mouth with interior parts, and other goodies. And don't forget that this unicorn will accept existing P4 horse textures, many of which can be found here in Free Stuff or at Pierian Piaffe.