Unstränng is a language I created for the Skollarians, a culture in the Legacies boffer LARP (though I created the language over a decade ago, so I think it has been forgotten).
Unfortunately, almost all of my data on the language was lost in a server crash. Unstränng was intended to look like Old Norse, so many words were inspired by old Norse. Grammar closely resembled Old Norse as well, in having several declensions. The conscious choice to include a 'heavy metal umlaut' was a part of this.
Some remaining examples of Unstränng: