Board Thread:Suggestions forum/@comment-27043702-20151128112216/@comment-26236093-20151128113959

TheOther FTW wrote: Well in the books, it was used by Gondor to get troops from Rohan, not Dor-en-ernil, who would have been obliged to send troops anyway, being a part of Gondor and all. Additionally, you should be able to craft these from orc arrows and blood (a new item).

Indeed, however I believe that if implmented this would resemble a Horn of Conquest in function, and would not be obtainable through the crafting system...