Osm The Osmium Horn Unicorn’s Story. Osm the unicorn with the multi-metal horn tipped with Osmium is the most awesome of all unicorns. This iridescent blue metal horn unicorn from Unimaise has the magical ability to make objects weigh 100 times their original weight. This has stopped the forward movement of many battle hardened troops. The osmium tip of his horn is so shiny that it can be seen glinting from miles away. Up close, when wielded as a wand it has been known to temporarily blind enemies. Read more.