I'd love to see an added section about the uses of the horn. Maybe you can powder it and use it for a value of XP in magic item crafting, Or maybe you can carve it to a spear tip and you can use it for a true strike effect x/day. Or maybe using the horn as a focus in a divination ritual of some sort makes it more powerful or more accurate. It's up to you.
Ok, i added som stuff about the horn. It has some magical properties and it's needed to craft some magical items. Also, i have some vague idea of creating a more ritual-like divination spell that uses it as either a focus or material component, but i haven't come up with anything yet.