rossrebailey
First Post
For a Horn of Blasting, I would imagine that all the usual metalworking tools would be needed, a furnace, perhaps molds for certain parts, and things like that. That's just off the top of my head, though, so it may not be worth the electrons making up these letters on your screen!
I recall (but can't get to source material right now) that magic armor and weapons must be of high-quality workmanship and concomitant price. I would think the same would go for horns, etc. Unless you want your character to be a jack-of-all-trades, I would assume you would start by finding someone to sell you a well-crafted, but non-magical, horn.